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<?xml version="1.0" encoding="UTF-8"?><OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd"><responseDate>2020-04-23T09:40:44Z</responseDate><request metadataPrefix="oai_ead" verb="ListRecords">http://your-public-oai-url.example.com</request><ListRecords><record><header><identifier>oai:archivesspace//repositories/2/resources/6</identifier><datestamp>2020-01-29T16:28:32Z</datestamp></header><metadata>
<ead xmlns="urn:isbn:1-931666-22-9" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:isbn:1-931666-22-9 http://www.loc.gov/ead/ead.xsd"><eadheader countryencoding="iso3166-1" dateencoding="iso8601" langencoding="iso639-2b" repositoryencoding="iso15511"><eadid countrycode="GB" mainagencycode="GB-237">Coll-1064</eadid><filedesc><titlestmt><titleproper>Papers of Professor Walter Ledermann <num>Coll-1064</num></titleproper></titlestmt><publicationstmt><publisher>Edinburgh University Library Special Collections</publisher><p id="logostmt"><extref xlink:actuate="onLoad" xlink:href="https://www.ed.ac.uk/sites/all/themes/uoe/assets/logo.png" xlink:show="embed" xlink:type="simple"/></p><address><addressline>Centre for Research Collections</addressline><addressline>University of Edinburgh Main Library</addressline><addressline>George Square</addressline><addressline>Edinburgh EH8 9LJ</addressline><addressline>is-crc@ed.ac.uk</addressline><addressline>URL: <extptr xlink:href="http://www.ed.ac.uk/is/crc" xlink:show="new" xlink:title="http://www.ed.ac.uk/is/crc" xlink:type="simple"/></addressline></address></publicationstmt></filedesc><profiledesc><creation>This finding aid was produced using ArchivesSpace on <date>2020-04-23 10:40:44 +0100</date>.</creation></profiledesc></eadheader><archdesc altrender="6" level="fonds">
<did>
<langmaterial>
<language langcode="eng">English</language>
</langmaterial>
<repository>
<corpname>Edinburgh University Library Special Collections</corpname>
</repository>
<unittitle>Papers of Professor Walter Ledermann</unittitle>
<origination label="Creator">
<persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname>
</origination>
<origination label="Creator">
<persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname>
</origination>
<unitid>Coll-1064</unitid>
<physdesc altrender="whole">
<extent altrender="materialtype spaceoccupied">0.12 metres</extent>
</physdesc>
<unitdate normal="1937/1954" type="inclusive">1937-1954</unitdate>
<physloc id="aspace_9ce357baf625d935c4ea19ab0d9b89f2">CLX-A-667</physloc>
<langmaterial id="aspace_2c1a697aafe0a48300516813635225dc">English</langmaterial>
</did>
<bioghist id="aspace_fd0c36811a558bff2a026e365ed6b30b">
<head>Biographical / Historical</head>
<p>Walter Ledermann was born on 18 Mar 1911, the second of William and Charlotte Ledermann's four children, in Berlin, Germany. His Father was a physician, though the family was accustomed to poverty following World War I and the depression of the 1920s.</p><p> Ledermann was a promising student from an early age, and a keen violinist. He received his leaving certificate from the Leibniz Gymnasium early due to his performance in classics and mathematics, which allowed him to complete his degree in Mathematics and Physics at the University of Berlin. There he encountered several mathematicians and physicists of note who inspired him, including Issai Schur, Heinz Hopf, Max Plank, and Erwin Shrodinger. </p><p> On completion of his degree, it became clear to Ledermann that he could no longer stay in Germany. He won a scholarship created by students at St Andrews to support a Jewish refugee, during which time his brother was working in Edinburgh to gain a medical qualification. Ledermann was awarded his PhD after two years. </p><p> Encouraged by Professor Turnbull of St Andrews University, Ledermann sought an interview with Professor Edmund Whittaker (later Sir) at the University of Edinburgh with a view to seeking employment there. Whittaker invited him to come as a visiting student to Edinburgh for one term, offering him a bursary of £50 and encouraging him to attend the lectures of A C Aitken. Aitken quickly became a friend to Ledermann, and introduced him to Godfrey Thomson, Bell Chair of Education at the University of Edinburgh, and Director of Edinburgh Provincial Training Centre (later Moray House College of Education).</p><p> At that time, Thomson required a mathematical assistant for a Carnegie funded project which would eventually result in the publication of his seminal book, <title>The Factorial Analysis of Human Ability</title>, and he immediately offered Ledermann the post. It is from this period that the majority of Ledermann's papers, which largely comprise of letters from Thomson, were created.</p><p> Ledermann's work with Thomson was interrupted for 6 months in 1937 when Ledermann accepted a post teaching at the University of Dundee. He returned to work with Thomson in Edinburgh until 1938, when he took a lecturer's post in the University of St Andrews.</p><p> In 1940, Ledermann's naturalization was completed, and he was also awarded his DSc from the University of Edinburgh. He married his wife, Ruth Ledermann, a social worker, in 1946, later having a son, Jonathon. The couple moved to Manchester, where Ledermann was worked as a lecturer in pure mathematics in the University of Manchester, from 1946-1962. </p><p> In 1962 Ledermann gained a lecture post at the new University of Sussex, where he eventually became a professor. He found the atmosphere of the modern university highly stimulating, and taught for two further years past the statutory age of retirement (then 65). Even after his official retirement in 1978, Ledermann continued to give occasional courses and revision classes to his students until 1997, when he and Ruth, by then a psychotherapist, moved to London.</p><p> Ledermann died in London on 22 May 2009.</p> </bioghist>
<scopecontent id="aspace_296179023ff62521952a67b10f3ab186">
<head>Scope and Contents</head>
<p>The collection largely consists of letters from Godfrey Thomson to Ledermann. Many are highly mathematical in content, containing formulae and mathematical notation, though they also regard social events and contain enquiries from Thomson with regards to the safety of Ledermann's family throughout the war.</p> </scopecontent>
<arrangement id="aspace_3ea3f6f825be5280b499e7393b4df0a7">
<head>Arrangement</head>
<p>The arrangement reflects the original order, and is largely chronological. The titles given to the letters reflect Ledermann's numbering system, with the letter numbered and the year in brackets.</p> </arrangement>
<custodhist id="aspace_dd26e2af2dece9ed29cc7a55818d55d4">
<head>Custodial History</head>
<p>Received directly from creator.</p> </custodhist>
<acqinfo id="aspace_8073f6fc7c567522be43671aacda524e">
<head>Immediate Source of Acquisition</head>
<p>E2005.18; E2006.20.</p> </acqinfo>
<appraisal id="aspace_e3cf0966ad33936ef1a43249f0699fb1">
<head>Appraisal</head>
<p>Appraised according to standard procedures.</p> </appraisal>
<accruals id="aspace_f13ec65a414439437eb5ffc7f2f45b0e">
<head>Accruals</head>
<p>None expected.</p> </accruals>
<userestrict id="aspace_6bad0cbdf4367af456df377dff4713df">
<head>Conditions Governing Use</head>
<p>Applications for permission to quote should be sent to the Director of Collections.</p><p> Reproduction subject to usual conditions: educational use and condition of documents.</p> </userestrict>
<accessrestrict id="aspace_579f8e1eb131aa26ff09cddaed212509">
<head>Conditions Governing Access</head>
<p>Open.</p> </accessrestrict>
<altformavail id="aspace_664df46189be4fe14d48adafd66845be">
<head>Existence and Location of Copies</head>
<p>No known copies.</p> </altformavail>
<originalsloc id="aspace_4e8b2097c38836272a2f85760773b5c5">
<head>Existence and Location of Originals</head>
<p>The material is original.</p> </originalsloc>
<relatedmaterial id="aspace_99cd93fac9117bf4af12a3bc6ee1662c">
<head>Related Materials</head>
<list type="ordered">
<item><archref href="EUA-IN1-ACU-G1">EUA IN1/ACU/G1</archref>, Records of the Godfrey Thomson Unit</item>
<item><archref href="Coll-1310">Coll-1310</archref>, Papers of Godfrey H Thomson</item>
</list>
</relatedmaterial>
<processinfo id="aspace_b929283751b32b8d7def8cf819854499">
<head>Processing Information</head>
<p>Catalogued by Emma Anthony, Project Archivist, Nov 2013, utilising a preliminary handlist created by Meghan Cote, Project Archivist, 2006.</p> </processinfo>
<bibliography id="aspace_e90c5128254ff5b43e5de6c8befb9e5b">
<head>Bibliography</head>
<p>No known publications using this material.</p> </bibliography>
<controlaccess>
<subject authfilenumber="sub_3283" source="lcsh">Intelligence tests</subject>
<subject authfilenumber="sub_314" source="lcsh">Statistics</subject>
<subject authfilenumber="sub_2497" source="lcsh">Psychology</subject>
<subject authfilenumber="sub_6175" source="lcsh">Intelligence</subject>
<subject authfilenumber="sub_103" source="lcsh">Education</subject>
<subject authfilenumber="sub_3285" source="lcsh">Education research</subject>
<subject authfilenumber="sh85082139 | sub_3427" source="lcsh">Mathematics</subject>
<subject authfilenumber="sub_3281" source="lcsh">Factor analysis</subject>
<geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname>
<persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname>
<persname authfilenumber="per_7832" source="local">Lawley, Derrick, 1915-2012 (statistician)</persname>
<persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname>
<persname authfilenumber="per_8723" source="local">Kelley, Truman Lee, 1884-1961 (psychometrician, statistician)</persname>
<persname authfilenumber="pers_3575" source="local">Aitken, Alexander Craig, 1895-1967 (mathematician)</persname>
<persname authfilenumber="per_8768" source="local">Thurstone, Louis Leon, 1887-1955 (psychometrician)</persname>
<persname authfilenumber="per_8461" source="local">Fisher, Ronald Aylmer, 1890-1962 (English statistician, evolutionary biologist, geneticist, and eugenicist)</persname>
<persname authfilenumber="per_7969" source="local">Burt, Cyril Lodowic, Sir, 1883-1971 (educational psychologist)</persname>
<persname authfilenumber="per_7836" source="local">Hotelling, Harold, 1895-1973 (mathematician)</persname>
<persname authfilenumber="per_3265" source="local">Bartlett, Maurice Stevenson, 1910-2002 (statistician)</persname>
<persname authfilenumber="per_7832" source="local">Lawley, Derrick, 1915-2012 (statistician)</persname>
<persname authfilenumber="per_8769" source="local">Emmett, William B, fl mid 20th century (psychologist)</persname>
<corpname authfilenumber="cor_73" source="local">University of Edinburgh (Scottish University)</corpname>
</controlaccess>
<dsc><c01 id="aspace_Coll-1064-1" level="item"><did><unittitle>1 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/1<extptr href="1171"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">2 Feb 1937</unitdate><physloc id="aspace_f26e905bc236930bb8f76ddb1258ed93">CLX-A-667</physloc><langmaterial id="aspace_54da5df07b31ec9a99cd3837eb02b46e">English</langmaterial></did><scopecontent id="aspace_42a8ab11c87226967cf39295d2199d49"><head>Scope and Contents</head><p>Thomson acknowledges receipt of Ledermann's letter and manuscript, expressing pleasure at Ledermann's continuing interest in factor analysis.</p><p> Thomson draws parallels between a formula Ledermann uses and the work of Kelley, specifically his <emph>pentad criterion</emph> as discussed in <title>Crossroads in the Mind of Man</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-2" level="item"><did><unittitle>2 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/2<extptr href="1172"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">10 Feb 1937</unitdate><physloc id="aspace_334e1b5507cd1b254f035a41c66f1f1f">CLX-A-667</physloc><langmaterial id="aspace_73d2b5f2799096d87d251cf9d819cbd8">English</langmaterial></did><scopecontent id="aspace_e1525d76ee2d4dddb32aa89bfeca5a62"><head>Scope and Contents</head><p>Thomson acknowledges receipt of Kelley's book, <title>Crossroads in the Minds of Man</title>. He advises Ledermann with regards to referencing Kelley's <emph>pentad criterion</emph> in his paper, while still recognising Ledermann's shorter method for arriving at the same result. </p><p> Thomson cites <title>Psychometrika</title> as the best publication for the paper, and offers to send it there if Ledermann is in agreement.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-3" level="item"><did><unittitle>3 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/3<extptr href="1173"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">16 Feb 1937</unitdate><physloc id="aspace_b48666f584b7f0e111ced2dced0f1325">CLX-A-667</physloc><langmaterial id="aspace_48a26498de1e9ba220ca5e2d128c74d7">English</langmaterial></did><scopecontent id="aspace_eade1df958f7f38748660aeafca67dad"><head>Scope and Contents</head><p>Thomson informs Ledermann that his secretary, Miss Matthews, is typing three copies of Ledermann's paper in order to submit to <title>Psychometrika</title>, and that these will be sent to him should he wish to make any changes before admission. </p><p> Thomson advises that he need not simplify the paper.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-4" level="item"><did><unittitle>5 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/4<extptr href="1174"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">5 Jun 1937</unitdate><physloc id="aspace_65a09861686e93dc6c7f36e0d3237c58">CLX-A-667</physloc><langmaterial id="aspace_7533b59c0b7658ef2602ea77b6f2f9d3">English</langmaterial></did><scopecontent id="aspace_9fe781aea11daddbded2bd7bc25aaf8b"><head>Scope and Contents</head><p>Thomson informs Ledermann that his leave of absence has been granted for 1937-1938, and tells him that he will be speaking with A C Aitken regarding the possibility of adding a mathematical computer to his team.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-5" level="item"><did><unittitle>7 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/5<extptr href="1175"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">28 Jun 1937</unitdate><physloc id="aspace_918a0736434f6310de4a210008f5197a">CLX-A-667</physloc><langmaterial id="aspace_61bfb1d6ecb9c6db4165d08d93b89027">English</langmaterial></did><scopecontent id="aspace_413558c41ca8bf8e98ceee4678ab6aa0"><head>Scope and Contents</head><p>Thomson discusses his plans for summer, which include lecturing at the Bingley Training College, and staying at Glenapp, Ayrshire, and informs Ledermann that he is not sure where he will be based for winter. </p><p> He advises Ledermann to undertake preparatory reading, and attaches a short reading list which includes the work of T L Kelley, L L Thurstone, W P Alexander, and Cyril Burt.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-6" level="item"><did><unittitle>8 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/6<extptr href="1176"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">8 Jul 1937</unitdate><physloc id="aspace_6b27f78bf0c59b9056ceaba278efbd92">CLX-A-667</physloc><langmaterial id="aspace_9465e1d2b2dee5a2106e60cfe8d2aa62">English</langmaterial></did><scopecontent id="aspace_8b9924241962c319d4dae8cc803e7fc5"><head>Scope and Contents</head><p>Thomson asks Ledermann to meet him at the Thackeray Hotel in London. He suggests further publications for Ledermann to read, particularly in relation to matrix methods, including publications by G Udny Yule, R A Fisher, and T L Kelley.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-7" level="item"><did><unittitle>9 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/7<extptr href="1177"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (6 leafs, 6 sides)</extent></physdesc><unitdate type="inclusive">17 Jul 1937</unitdate><physloc id="aspace_7de19a6e90e54e72b81239d9508dffaa">CLX-A-667</physloc><langmaterial id="aspace_5aef9da7645e081799bb0153b7f50863">English</langmaterial></did><scopecontent id="aspace_aeb2b38f4dc6886b9d6ff8e2f938e953"><head>Scope and Contents</head><p>Thomson discusses the difficulties of calculating correlations between persons, referring to Burt's article, <title>Correlations Between Persons</title>, from <title>the British Journal of Psychology</title>, Jul 1937; his own paper, <title>On Complete Families</title>, from <title>the British Journal of Psychology</title>, Jul 1935, in which he states he was the first person to suggest the idea of correlations between persons, as well as the many difficulties in the way of this; and a letter he received from Dr William Stephenson, which has not survived in the collection. </p><p> He refers to the work of Burt, specifically in relation to correlating two people who have been given different tests, illustrating his points with calculations throughout.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-8" level="item"><did><unittitle>10 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/8<extptr href="1178"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">19 Jul 1937</unitdate><physloc id="aspace_0de8a2f6b31b38f10e3c6b7fbdf78e7c">CLX-A-667</physloc><langmaterial id="aspace_123f4f98b393da5ff98009a5e3ff38e4">English</langmaterial></did><scopecontent id="aspace_d7cd375590f88b7a1cd6a652a598b8a9"><head>Scope and Contents</head><p>Thomson continues to discuss Burt's paper, <title>The Correlation between Persons</title>, from <title>the British Journal of Psychology</title>, Jul 1937, providing an alternative to Burt's formula, which he criticises as being unnecessarily complex.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-9" level="item"><did><unittitle>11 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/9<extptr href="1179"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">20 Jul 1937</unitdate><physloc id="aspace_d5550eb5209c2f6e17c2bbb8e0257e4a">CLX-A-667</physloc><langmaterial id="aspace_bf3a21114f34a5d3a6c7a0521b9fb848">English</langmaterial></did><scopecontent id="aspace_3c7d2b0d1b31e1eeb8bf397c93d50851"><head>Scope and Contents</head><p>Thomson continues to discuss Burt's article, <title>The Correlation between Persons</title>. He reproduces equations Ledermann sent in response to his previous letter, and asks him to clarify them.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-10" level="item"><did><unittitle>12 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/10<extptr href="1180"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">25 Jul 1937</unitdate><physloc id="aspace_791359b30560c4bb466b9bda54a41dd6">CLX-A-667</physloc><langmaterial id="aspace_e7c66ca8a0a9b85542053c7401e2cdbf">English</langmaterial></did><scopecontent id="aspace_82365dc6b259bb328c359dfd09e2d60f"><head>Scope and Contents</head><p>Thomson gives Ledermann his address at the Training College, Bingley, for the following fortnight, informing him he will be lecturing there and asking him to write. He also mentions an enclosed cheque, which has not survived in the collection, asking Ledermann to sign and return it.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-11" level="item"><did><unittitle>13 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/11<extptr href="1181"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">6 Aug 1937</unitdate><physloc id="aspace_a7d4a6e6fe57a55cf05854e32678ad3f">CLX-A-667</physloc><langmaterial id="aspace_b35aec8e3115c1de5dd0f7dd18459a12">English</langmaterial></did><scopecontent id="aspace_f0fd050cf3a6047b37e17d0684b4554c"><head>Scope and Contents</head><p>Thomson advises Ledermann to keep the letters he sends him for future reference. He discusses a paper he has written for <title>the British Journal of Psychology</title>, which regards the influence selection has over factorial analysis, and asks Ledermann if he should shorten it. </p><p> He advises Ledermann to make use of some of the concepts for a paper of his own regarding matrix notation, and refers him to work of Hotelling, Thurstone, and Aitken, particularly Aitken's paper, <title>Note on Selection from a Multivariate Normal Population</title>, from <title>Proceedings of Edinburgh Mathematical Society</title>, 1935.</p><p> Thomson also discusses the possibility of locating a copy of Darmois' <title>Statistique Mathematique</title>, and informs Ledermann of his plans for the next few weeks, which include returning to Edinburgh then possibly staying at Glenapp in Ayrshire.</p></scopecontent></c01><c01 id="aspace_Coll-1064-12" level="item"><did><unittitle>14 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/12<extptr href="1182"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">14 Aug 1937</unitdate><physloc id="aspace_7c0de043ce168682c31deb82fa66249f">CLX-A-667</physloc><langmaterial id="aspace_3c2c9771fc353e741c305cbb510fa92e">English</langmaterial></did><scopecontent id="aspace_23690b8f224a5389872b805fe19fa0a0"><head>Scope and Contents</head><p>Thomson refers to a proof or article which he had enclosed. This has not survived in the collection. He does not name the author, but suggests to Ledermann that he may want to contact him, either sending the letter by the fastest ship or communicating by cable, charging the costs to the Carnegie fund.</p><p> He refers to his <title>British Journal of Psychology</title> article discussed previously; highlighting that he wishes it to be understood by less mathematical readers, and encouraging Ledermann to follow it with a more mathematical one.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-13" level="item"><did><unittitle>15 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/13<extptr href="1183"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter, (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">16 Aug 1937</unitdate><physloc id="aspace_faa01dd99a2e64843ec25f908b3b747b">CLX-A-667</physloc><langmaterial id="aspace_57652af0266715d6a37fb2fecbd33621">English</langmaterial></did><scopecontent id="aspace_fef160b883c88a33ae972ecfec9cc2f5"><head>Scope and Contents</head><p>Thomson informs Ledermann that he has submitted his paper to <title>the British Journal of Psychology</title>, and has included a referral to a future article of Ledermann's.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-14" level="item"><did><unittitle>16 (37), Ledermann to Thomson</unittitle><unitid>Coll-1064/14<extptr href="1184"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">18 Aug 1937</unitdate><physloc id="aspace_a68f9fb522c201733d1eecce8ae10b04">CLX-A-667</physloc><langmaterial id="aspace_c1e6a8db1c1464d85d50f25e280da83d">English</langmaterial></did><scopecontent id="aspace_503d5f71d00e07b742e9e9fcab26b3b5"><head>Scope and Contents</head><p>Thomson tells Ledermann how pleased he is that he is that Ledermann is going to follow up his [Thomson's] paper for <title>the British Journal of Psychology</title>, and asks him to include material regarding multivariate selection. </p><p> He talks about the various reading he has undertaken, referring to work by Bocher, Hotelling, and Turnbull; and discusses the connection between <emph>the correlation of orthogonal vectors produced by selection in the population, and the correlation of orthogonal vectors produced by estimating them from insufficient equations</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-15" level="item"><did><unittitle>17 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/15<extptr href="1185"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side); 1 handwritten manuscript, (14 leafs 14 sides)</extent></physdesc><unitdate type="inclusive">25 Aug 1937</unitdate><physloc id="aspace_b6d34095813592e1b635846fabc3f01e">CLX-A-667</physloc><langmaterial id="aspace_8de26dc253a5082336324e56fbdc5f4a">English</langmaterial></did><scopecontent id="aspace_5fe7d17fa596f0abd4187a1486e5cabf"><head>Scope and Contents</head><p>Thomson informs Ledermann that he has sent Ledermann's paper to <title>the British Journal of Psychology</title>, with some minor corrections. He tells Ledermann he should take some time off when his Mother visits him, and apologises for not being able to invite him to Glenapp. </p><p> Also includes a manuscript, numbered <emph>17a (37)</emph> which Thomson sets a problem for Ledermann, asking him in his letter if he can provide a proof.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-16" level="item"><did><unittitle>18 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/16<extptr href="1186"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (6 leafs, 6 sides)</extent></physdesc><unitdate type="inclusive">29 Aug 1937</unitdate><physloc id="aspace_bdfc46aaa153950e074d5bdefd2bc6c1">CLX-A-667</physloc><langmaterial id="aspace_58f6a281d96ecdc7db698f0df3a820a0">English</langmaterial></did><scopecontent id="aspace_b570695e5faeabb9cb446de900466a76"><head>Scope and Contents</head><p>Thomson thanks Ledermann for his response to his previous letter, stating how neat his proofs are and discussing them at length. He refers to a paper of Aitken's published in the Edinburgh Mathematics Society, series 2, vol. 4, part II, and explores how the formula therein can assist them. The letter is unsigned, so appears to be incomplete.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-17" level="item"><did><unittitle>19 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/17<extptr href="1187"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (6 leafs 6 sides)</extent></physdesc><unitdate type="inclusive">14 Sept 1937</unitdate><physloc id="aspace_9ea99a5ff5af318a6faa64c981f65d5d">CLX-A-667</physloc><langmaterial id="aspace_50dd95bc01dff54ddb76f73d129ea1c5">English</langmaterial></did><scopecontent id="aspace_c33e3e7b8567351a4e51254dba3a8bda"><head>Scope and Contents</head><p>Thomson stresses that he does not wish Ledermann to reply to the letter while his Mother is visiting. He refers to a manuscript he sent Ledermann regarding the connection between estimation and selection, outlining a point he can add to it and referring to matrices of Aitken's. </p><p> He discusses orthogonal projection, estimation of regression, the selection formulae, and how these can be seen as one; as well as the division of factorial analysis after selection into two parts.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-18" level="item"><did><unittitle>20 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/18<extptr href="1188"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (12 leafs, 12 sides)</extent></physdesc><unitdate type="inclusive">15 Sept 1937</unitdate><physloc id="aspace_35358d42f4d4e9a54ca6e205db9cb73f">CLX-A-667</physloc><langmaterial id="aspace_69d805fcd939ebdb4a7dfee4a05aafdc">English</langmaterial></did><scopecontent id="aspace_c5da33c3a9a3acc314dcbda38143f6c5"><head>Scope and Contents</head><p>Thomson writes to Ledermann regarding <title>the method of sums of differences</title>, which Thomson uses frequently in his work but with which Ledermann is unfamiliar. </p><p> He refers Ledermann to a 1909 paper of Spearman's in which the method was first used, and explains the form of the method he himself has used since, which he refers to as the <emph>pooling square</emph>. He goes on to discuss Hotelling's paper on <emph>the most predictable criterion</emph> in <title>the Journal of Educational Psychology</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-19" level="item"><did><unittitle>21 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/19<extptr href="1189"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">26 Sept 1937</unitdate><physloc id="aspace_e9a2499b68f73b47758464ae195ff889">CLX-A-667</physloc><langmaterial id="aspace_1ceef07527adf8b216fb565017d26864">English</langmaterial></did><scopecontent id="aspace_2f4b33282fadddbe433a54ad3686d28a"><head>Scope and Contents</head><p>Thomson thanks Ledermann for his letters, and discusses his study of the problem of estimation, referring to the work of Bartlett. He also informs Ledermann that he has ordered Darmois' book,<title> Methodes d' Estimation</title>, and asks him if he thinks it worthwhile buying a copy of Cullis' Matrices and Determinoids. </p><p> Thomson advises Ledermann to keep account of postage and expenditure so he can be reimbursed for these, and informs him of his whereabouts for the next few months in order to arrange a meeting time.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-20" level="item"><did><unittitle>22 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/20<extptr href="1190"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (10 leafs, 10 sides)</extent></physdesc><unitdate type="inclusive">30 Sept 1937</unitdate><physloc id="aspace_2db1d8f986f1c1cb28ae7b1304165c21">CLX-A-667</physloc><langmaterial id="aspace_e1edc7db3df1a53be905e1becb0d9da7">English</langmaterial></did><scopecontent id="aspace_325ab7dd80e88b2afe10d31271363652"><head>Scope and Contents</head><p>Thomson discusses M S Bartlett's proposed method of estimating factors as given in his <title>British Journal of Psychology</title> articles of Oct 1935 and Jul 1937. Thomson interprets the method, with the letter containing several pages of working for Ledermann's comments.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-21" level="item"><did><unittitle>23 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/21<extptr href="1191"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postscript (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">1 Oct 1937</unitdate><physloc id="aspace_258c1e5b881252357ee2ca4eaceece05">CLX-A-667</physloc><langmaterial id="aspace_bf420111317e108bd825b0b935fe9316">English</langmaterial></did><scopecontent id="aspace_722b578cf7e9377150871712a23cca40"><head>Scope and Contents</head><p>Postscript following on from Thomson's previous letter in which he expounds further upon his interpretation of M S Bartlett's proposed method of estimating factors.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-22" level="item"><did><unittitle>24 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/22<extptr href="1192"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (7 leafs, 7 sides)</extent></physdesc><unitdate type="inclusive">4 Oct 1937</unitdate><physloc id="aspace_ac4fbb21e4adacbe25c73bc514e1d1c7">CLX-A-667</physloc><langmaterial id="aspace_ffeaf101307720477e36e693d9010bb8">English</langmaterial></did><scopecontent id="aspace_f2c8cdc5b8efff7e2ae431f184738b43"><head>Scope and Contents</head><p>Thomson discusses his <emph>way of calculating what values may be given to the elements of Vpp in a hierarchical matrix</emph>, illustrating this with several pages of working for Ledermann's comment.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-23" level="item"><did><unittitle>25 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/23<extptr href="1193"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 small postcard (2 sides)</extent></physdesc><unitdate type="inclusive">4 Oct 1937</unitdate><physloc id="aspace_3f85718fc087f12c4cbe12b3e5a743da">CLX-A-667</physloc><langmaterial id="aspace_91fa75874df290a525535154ed0abf24">English</langmaterial></did><scopecontent id="aspace_cc898db178ac1a4e970f5c980b1081b8"><head>Scope and Contents</head><p>Small postcard regarding Ledermann's comments on Thomson's use of the <emph>auxiliary matrix</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-24" level="item"><did><unittitle>26 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/24<extptr href="1194"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">8 Oct 1937</unitdate><physloc id="aspace_29f7482a935b27790b9555e1401443e5">CLX-A-667</physloc><langmaterial id="aspace_71f84743523e1f66fe9a67b6d37ed4d1">English</langmaterial></did><scopecontent id="aspace_f6a335043417384b4c6f6c4ed5d59123"><head>Scope and Contents</head><p>Postcard acknowledging Ledermann's letter regarding Bartlett's estimates, which Thomson doubts have <emph>the minimum standard error</emph>. He discusses the <emph>error variances</emph> of the regression estimates, referring to a numerical example he has sent.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-25" level="item"><did><unittitle>27 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/25<extptr href="1195"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">16 Oct 1937</unitdate><physloc id="aspace_10b4e75758a68b658257f0258c750463">CLX-A-667</physloc><langmaterial id="aspace_f7437c7a37cfa4406910a8edf089e26b">English</langmaterial></did><scopecontent id="aspace_87284e2ec41e7d9b0781380535bc0fe2"><head>Scope and Contents</head><p>Thomson asks Ledermann for his opinion on Thomson first draft of his section of their multivariate paper. He asks for Ledermann's advice on a few areas in particular, listing them and any potential problems he thinks may arise.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-26" level="item"><did><unittitle>Un-numbered postcard, Thomson to Ledermann</unittitle><unitid>Coll-1064/26<extptr href="1196"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">22 Oct 1937</unitdate><physloc id="aspace_258f5081fe593f979299834068903d97">CLX-A-667</physloc><langmaterial id="aspace_98476b1d1b652e5ea201f4326be487d1">English</langmaterial></did><scopecontent id="aspace_d5f7a1e0edeb0a1fcaff7b1f120726ba"><head>Scope and Contents</head><p>Thomson confirms arrangements for he and Ledermann's meeting, and asks him to bring Bartlett's offprints with him.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-27" level="item"><did><unittitle>28 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/27<extptr href="1197"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">25 Oct 1937</unitdate><physloc id="aspace_65460d29bbd3d89da6c6b73fe7cb081a">CLX-A-667</physloc><langmaterial id="aspace_5adbee09ba1959b11e4b8cbca59661a1">English</langmaterial></did><scopecontent id="aspace_d3181ae458d62f4ac0a0997d97f87ed6"><head>Scope and Contents</head><p>Thomson outlines his interpretation of Bartlett's work, referring to a letter he sent Bartlett the previous day, for Ledermann's consideration.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-28" level="item"><did><unittitle>29 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/28<extptr href="1198"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides); 1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">5 Nov 1937-7 Nov 1937</unitdate><physloc id="aspace_b2e5bd88f5459daaca29d4f80161c11b">CLX-A-667</physloc><langmaterial id="aspace_064a9d24140ebd91496b436f7cd47572">English</langmaterial></did><scopecontent id="aspace_5353f8fa80b8bf2bc5e72554f49d3819"><head>Scope and Contents</head><p>In his letter, dated 5 Nov 1937 and numbered <emph>29 (37)</emph> Thomson discusses two papers on <emph>boundary conditions</emph> he and Ledermann contributed to <title>Psychometrika</title> in relation to <emph>orthogonal and oblique factors</emph>. </p><p> He refers to the work of Holzinger and Harman in their article from <title>the Journal of Educational Psychology</title>, specifically in relation to their analysis of a matrix of correlations and how Thomson's boundary rule can be applied to this.</p><p> In the small postcard, dated 7 Nov 1937 and numbered Thomson asks Ledermann to leave Bartlett's offprints with him at their next meeting.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-29" level="file"><did><unittitle>30 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/29<extptr href="1199"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">3 letters (4 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">8 Nov 1937- 12 Nov 1937</unitdate><physloc id="aspace_fa632729d01791dc86059054e431d2c2">CLX-A-667</physloc><langmaterial id="aspace_679b6d68dabafce41281e4232837121b">English</langmaterial></did><scopecontent id="aspace_2da94027ac3a05d682ec879e7de60fd8"><head>Scope and Contents</head><p>Contains a letter from Thomson, dated 8 Nov 1937 and numbered <emph>30 (37)</emph> in which he asks Ledermann to post an enclosed letter to Dr Horst if he thinks it correct; the enclosed letter to Dr Horst, dated 8 Nov 1937 and numbered <emph>30a (37)</emph>; and a further letter from Thomson to Ledermann, dated 12 Nov 1937 and numbered <emph>30b (37)</emph> which asks him to obtain details of translations of Pliny's letters held at Edinburgh University Library for the use of Thomson's son, Hector.</p><p> The letter to Dr Horst regards Horst's manuscript, which he sent to Thomson for his comments. Thomson finds many aspects of the paper problematic. He outlines these, explaining why, and encourages Horst to have the paper read by others too.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-30" level="item"><did><unittitle>31 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/30<extptr href="1200"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">14 Nov 1937</unitdate><physloc id="aspace_d4680169514b21a35d4f4fbe711a42e8">CLX-A-667</physloc><langmaterial id="aspace_40014f5132c9106c55b2c93df9b21f6f">English</langmaterial></did><scopecontent id="aspace_78770d8dcb929724b834672f874ffedb"><head>Scope and Contents</head><p>Thomson thanks Ledermann for his letter regarding minimum trace and minimum <emph>Thorstone</emph> [sic] rank which showed they do not always occur together, but Thomson argues that they usually do. </p><p> He discusses matrices, referring to the work of Heywood, Spearman, and Thurstone; as well as an article that he would like to write.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-31" level="item"><did><unittitle>32 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/31<extptr href="1201"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">19 Nov 1937</unitdate><physloc id="aspace_05f81ba5dde51e7a2d0c725b23e48a2e">CLX-A-667</physloc><langmaterial id="aspace_42fa1471f1345e985f96abf8b125db2e">English</langmaterial></did><scopecontent id="aspace_b75a5ec655912e529f595f1981727c49"><head>Scope and Contents</head><p>Thomson has written the letter on a sheet containing a short note of Ledermann's regarding a volume of Pliny's letters.</p><p> He discusses the connection between the Heywood case and Ledermann's condition, illustrating this with working, and refers to Spearman's commonalities.</p></scopecontent></c01><c01 id="aspace_Coll-1064-32" level="item"><did><unittitle>33 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/32<extptr href="1202"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">8 Dec 1937</unitdate><physloc id="aspace_e602ea8323bd4c587574f7a0251f3a2b">CLX-A-667</physloc><langmaterial id="aspace_bcf73f2586d0c78f45718b7af1f7de48">English</langmaterial></did><scopecontent id="aspace_ab116883aa2d364607537958a02ecb81"><head>Scope and Contents</head><p>Thomson discusses his travels to London and the Lake District; Ledermann's enrolment as a DSc student; Ledermann's papers on <emph>automorphic</emph> matrices and boundary conditions respectively, and potential publishers for these; and <emph>hierarchical Heywood cases</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-33" level="item"><did><unittitle>34 (37), Thomson to Ledermann</unittitle><unitid>Coll-1064/33<extptr href="1203"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">18 Dec 1937</unitdate><physloc id="aspace_1d46521c64c5c2bac0b7e420e1a08883">CLX-A-667</physloc><langmaterial id="aspace_405362caf7e399cc156fc152647da109">English</langmaterial></did><scopecontent id="aspace_590fd17d07f1ef13e58dc4371651d774"><head>Scope and Contents</head><p>Thomson informs Ledermann that his article can be printed in <title>Sociometrika</title> or <title>Psychometrika</title>. He is unsure if the former exists and thinks it may be a typing error.</p><p> Thomson mentions that he has many letters and manuscripts of Ledermann still to acknowledge. These cover topics such as boundary conditions, and Ridley Thomson's criterion. Thomson lists the letters and manuscripts with brief comments.</p><p> He also discusses the progress of <title>The Factorial Analysis of Human Ability</title>, briefly outlining a possible structure and referring to work he has consulted including that of E B Wilson, Maxwell Garnett, and Irwin.</p><p> Thomson finishes the letter by telling Ledermann to have a good holiday.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-34" level="item"><did><unittitle>1 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/34<extptr href="1204"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">1 Jan 1938</unitdate><physloc id="aspace_9e9202c5c6522e67464d0c8ae8f021c8">CLX-A-667</physloc><langmaterial id="aspace_f382126422b0251e6177ef3de0cbb850">English</langmaterial></did><scopecontent id="aspace_02e6851bffd43de20d98b6e395cee47a"><head>Scope and Contents</head><p>Thomson asks Ledermann to explain an article of C Spearman's. The unnamed article is referred to in Spearman's <title>The Abilities of Man</title>, and regards <emph>the reversibility of proof</emph> of Spearman's tetrad criterion.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-35" level="item"><did><unittitle>2 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/35<extptr href="1205"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">10 Jan 1938</unitdate><physloc id="aspace_d56d049dcbbfce1477358e7416dadf06">CLX-A-667</physloc><langmaterial id="aspace_97c300d49f8c0d29308b31586d5f46fd">English</langmaterial></did><scopecontent id="aspace_791ac2c13e5d578416ae78ccfd89d8ba"><head>Scope and Contents</head><p>Thomson refers to a letter he was planning on sending to <title>Nature</title>, which was originally enclosed but has not survived in the collection. He asks Ledermann to check the letter, and post it if it is correct.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-36" level="item"><did><unittitle>3 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/36<extptr href="1206"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (4 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">27 Jan 1938</unitdate><physloc id="aspace_f17fdbbcc2c5fab8cd9c1031101cbdae">CLX-A-667</physloc><langmaterial id="aspace_74f2d7626ebc2b1564703ea38a0ea503">English</langmaterial></did><scopecontent id="aspace_f0faefa30d650df00f38e760cef61159"><head>Scope and Contents</head><p>Thomson asks Ledermann to tidy his proof regarding <emph>Bartlett's estimation of the common factors</emph> and put it into more mathematical terms. He attaches the proof for Ledermann's consideration.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-37" level="item"><did><unittitle>4 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/37<extptr href="1207"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">31 Jan 1938</unitdate><physloc id="aspace_1b5a60e9bf887d7407bb489032e2b78b">CLX-A-667</physloc><langmaterial id="aspace_8f42864c68806588fead1d2f4b460fad">English</langmaterial></did><scopecontent id="aspace_433bc18ab1ea95918e1aa29ffc9d19f6"><head>Scope and Contents</head><p>Small postcard in which Thomson invites Ledermann to dinner, asking him to bring his violin. He refers to a letter he has had from M S Bartlett regarding a proof.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-38" level="item"><did><unittitle>5 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/38<extptr href="1208"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">1 Feb 1938</unitdate><physloc id="aspace_a0d98687d85f230321635c1d0cf48de6">CLX-A-667</physloc><langmaterial id="aspace_059f5fe11b9e4ce4e20d8787cc1c6798">English</langmaterial></did><scopecontent id="aspace_18ef3590f219e1fcca3128ff3edabcf0"><head>Scope and Contents</head><p>Thomson offers to change the date of his previous dinner invitation, and states that he has enclosed the <emph>Doolittle</emph> calculation along with the letter and card from M S Bartlett referred to in his last letter. These items have not survived in the collection.</p><p> Thomson suggests that while Bartlett's letter is interesting, he does not agree that his estimates are unbiased. </p><p> Thomson asks Ledermann to read through chapters three and four of <title>The Factorial Analysis of Human Ability</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-39" level="item"><did><unittitle>6 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/39<extptr href="1209"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">7 Feb 1938</unitdate><physloc id="aspace_d218c2c0f989df1231689ea5c7c2a3d6">CLX-A-667</physloc><langmaterial id="aspace_1a2e916604e56302e5875528060e3793">English</langmaterial></did><scopecontent id="aspace_33a6ddea80e5ab1a6ed972d9c760583d"><head>Scope and Contents</head><p>Thomson asks Ledermann to clarify a point he made regarding Thomson's statement about t[etrad] d[ifferences], including examples for his attention.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-40" level="item"><did><unittitle>7 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/40<extptr href="1210"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">10 Feb 1938</unitdate><physloc id="aspace_26b41d1deffc0deec0d57679ebb17669">CLX-A-667</physloc><langmaterial id="aspace_47636bae7071f3105cf0a61eeaa7e87e">English</langmaterial></did><scopecontent id="aspace_83d3ac5e1c1aba1f12030273cc0b187c"><head>Scope and Contents</head><p>Thomson asks Ledermann to investigate a matter regarding the <emph>centering</emph> of a matrix of marks which he reproduces in the letter.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-41" level="file"><did><unittitle>8 (38) Thomson to Ledermann</unittitle><unitid>Coll-1064/41<extptr href="1211"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">3 letters, (10 leafs, 10 sides)</extent></physdesc><unitdate type="inclusive">15 Jan 1938-12 Feb 1938</unitdate><physloc id="aspace_3df3113be63302fe354af6bd389874ca">CLX-A-667</physloc><langmaterial id="aspace_d8a44c412b6a6f3ec3a33f2c05bd82d3">English</langmaterial></did><scopecontent id="aspace_aec0d1a9bd36b41b6efb61291703a9a9"><head>Scope and Contents</head><p>Contains three letters, largely unrelated. In the first letter, dated 15 Jan 1938 and numbered <emph>8a (38)</emph>, Thomson informs Ledermann that his [Thomson's] manuscript regarding univariate selection has been sent back to him by F C Bartlett, as the publisher requires it typed, and advises him that his own manuscript has likely been sent back for the same reason. </p><p> In the second letter, dated 17 Jan 1938 and numbered <emph>8b (38)</emph>, Thomson asks Ledermann to check the <title>Psychometric</title> offprints for any misprints. He refers to work by Dodd he had originally enclosed on loan from J Neyman. This has not survived in the collection.</p><p> In the third letter, dated 12 Feb 1938 and numbered <emph>8 (38)</emph>, Thomson continues from <emph>7 (38)</emph> (<ref target="Coll-1064-40">Coll-1064/40</ref>). He reproduces matrices of raw marks, and refers to <emph>partial correlations between the tests for constant average marks for each child</emph>. He provides several pages of examples and working.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-42" level="item"><did><unittitle>9 (38), Ledermann to Thomson</unittitle><unitid>Coll-1064/42<extptr href="1212"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">18 Feb 1938</unitdate><physloc id="aspace_3d4dc8f96852c719b10696af48f7bf40">CLX-A-667</physloc><langmaterial id="aspace_3cea49bc0fb33e79225e564b1ff3bcb9">English</langmaterial></did><scopecontent id="aspace_0cb99df0ce07aaf2632fc67dcb56c174"><head>Scope and Contents</head><p>Thomson informs Ledermann he has received proofs from <title>the British Journal of Psychology</title>, and expresses regret that he and Ledermann's <emph>Univariate</emph> articles are to be separated in different volumes.</p><p> He also informs Ledermann that he will send his cheque on the first of the month, since this will give them some interest in the account, and gives him the address of James Fitzjames Duff in Durham, where he will be staying.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-43" level="item"><did><unittitle>10 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/43<extptr href="1213"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (7 leafs, 7 sides)</extent></physdesc><unitdate type="inclusive">21 Feb 1938</unitdate><physloc id="aspace_8adbcf1edf37757f3827eb4587d660ad">CLX-A-667</physloc><langmaterial id="aspace_0d0a44486c43bad260b5caced6037889">English</langmaterial></did><scopecontent id="aspace_51a10d638b04e81e0f4f665bb69bbcb1"><head>Scope and Contents</head><p>Thomson asks Ledermann to discuss an example given by Burt in his article on correlations between persons which Thomson is having difficulty with, at their next meeting. He expounds upon the point in great detail, with most of the letter taken up with his working.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-44" level="item"><did><unittitle>11 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/44<extptr href="1214"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter, 1 postscript (8 leafs, 8 sides)</extent></physdesc><unitdate type="inclusive">27 Feb 1938-28 Feb 1938</unitdate><physloc id="aspace_e67e7ad5dac5046312e687a72745c581">CLX-A-667</physloc><langmaterial id="aspace_92713391c6d15657cd5fa0896daef312">English</langmaterial></did><scopecontent id="aspace_e4b262ad76f99f8d3cd03532e0ddc438"><head>Scope and Contents</head><p>Thomson explores his discovery regarding correlation co-efficients, or what he refers to as <emph>profile correlations</emph>, in a doubly centred matrix in relation to Thurstone's <emph>centroid process</emph>. </p><p> He also refers to Ledermann's assertion regarding the <emph>approach of a powered matrix to rank one as the power rises</emph>, stating that he disagrees, and referring to the work of Burt.</p><p> Also includes a post script which continues the discussion, referring to Thurstone's <emph>repetitive process</emph>, as well as containing a transcript of a letter written by M S Bartlett to <title>Nature</title> regarding a letter of Thomson's.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-45" level="item"><did><unittitle>12 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/45<extptr href="1215"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter, (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">1 Mar 1938</unitdate><physloc id="aspace_78e2472505a385e7f8a98f5cc53f1b7f">CLX-A-667</physloc><langmaterial id="aspace_f73c4039d294b30c5f8b4f8336e47136">English</langmaterial></did><scopecontent id="aspace_3b122c7a5d8ba04c627735fd58db0bba"><head>Scope and Contents</head><p>Thomson refers to his previous letters regarding correlation co-efficients in a doubly centred matrix. He tells Ledermann he was wrong in some respects, and asks him further questions in relation to the work of Burt.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-46" level="file"><did><unittitle>13 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/46<extptr href="1216"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (5 leafs, 5 sides), 1 postcard (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">3 Mar 1938-5 Mar 1938</unitdate><physloc id="aspace_40d2e59b3a8a77bf856c6026f4e1c955">CLX-A-667</physloc><langmaterial id="aspace_29c2261afb8001882dec3ab3134512a7">English</langmaterial></did><scopecontent id="aspace_93f13578e9d4149675adb10aaa0691d9"><head>Scope and Contents</head><p>In his letter, dated 3 Mar 1938 and numbered <emph>13 (38)</emph>, Thomson thanks Ledermann for his previous letter, and responds to his points regarding the <emph>reciprocity of persons and tests</emph>, referring to Burt's statement <emph>that we can always deduce all we want to know about person-factors from an analysis into test-factors, or vice versa, and need only perform whichever analysis is convenient</emph>. Thomson disagrees with this, apart from in the case of doubly centred matrices, and illustrates his point with examples throughout.</p><p> Also includes a postcard, dated 5 Mar 1938 and numbered <emph>13a (38)</emph>, in which Thomson asks Ledermann to work out a formula using M S Bartlett's <emph>principle of minimising the other factors not used</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-47" level="item"><did><unittitle>14 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/47<extptr href="1217"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (6 leafs, 6 sides)</extent></physdesc><unitdate type="inclusive">6 Mar 1938</unitdate><physloc id="aspace_bf907e58bda0b428ad82f8f61d0d3f52">CLX-A-667</physloc><langmaterial id="aspace_96e69d5a77437ba56a103b858be9b8af">English</langmaterial></did><scopecontent id="aspace_9396b9a70a07276aae19dc6edc892b59"><head>Scope and Contents</head><p>Thomson comments briefly on Thurstone's <title>The Vectors of the Human Mind</title>, pointing out that Thurstone uses a theorem proved by Burt. </p><p> Thomson also refers Ledermann to articles he and Ledermann wrote for <title>Psychometrika</title> on boundary conditions, since this is something he wishes to write about in <title>The Factorial Analysis of Human Ability</title>.</p><p> He informs Ledermann that he will be taking part in a discussion at the Royal Society in London regarding <emph>The Application of Quantitative Methods to Certain Problems in Psychology</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-48" level="item"><did><unittitle>15 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/48<extptr href="1218"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (4 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">8 Mar 1938-9 Mar 1938</unitdate><physloc id="aspace_5281ffca3daeee3061ef176dac694871">CLX-A-667</physloc><langmaterial id="aspace_c52c88b40a706ae22f16e7622b7597ac">English</langmaterial></did><scopecontent id="aspace_76bd1cfc21a35dfa1fc26999105f442a"><head>Scope and Contents</head><p>Thomson discusses some areas of uncertainty he has regarding <emph>making back estimates of the scores z from the first few Hotelling factors</emph>, referring to <emph>Bartlett's estimates of the Thurstone common factors</emph>. </p><p> Thomson asks Ledermann whether the back estimates using the Hotelling method or Bartlett-Thurstone method are best. He has added a short post script at the end of his letter the next day stating M S Bartlett's method is best.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-49" level="item"><did><unittitle>16 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/49<extptr href="1219"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">9 Mar 1938</unitdate><physloc id="aspace_6a90d34f7783bfbde5f5093611d325ea">CLX-A-667</physloc><langmaterial id="aspace_f8338b62e2d8fa5ffe4bd8431f7ee68f">English</langmaterial></did><scopecontent id="aspace_a285d76253e278106da10f83db578fb0"><head>Scope and Contents</head><p>Thomson informs Ledermann that Burt, Spearman, and Myers are to be the other speakers at the Royal Society discussion he is participating in, and that he has asked if Ledermann and Emmett may attend as guests.</p><p> He refers to a <emph>geometrical discussion of Bartlett's form of estimation</emph> which he originally sent with the letter for Ledermann's comments. This has not survived in the collection.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-50" level="file"><did><unittitle>17 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/50<extptr href="1220"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (13 leafs, 13 sides)</extent></physdesc><unitdate type="inclusive">13 Mar 1938</unitdate><physloc id="aspace_debb47d9d9bdfdd1e61b9e506418d2bb">CLX-A-667</physloc><langmaterial id="aspace_4cc2f41f5a56ed60c25c0a8d596e7d61">English</langmaterial></did><scopecontent id="aspace_9399b60b694455a74fab7f277a87a8ef"><head>Scope and Contents</head><p>In the first letter, dated 13 Mar 1928 and numbered <emph>17 (38)</emph>, Thomson discusses the work of M S Bartlett, in particular <emph>that the assumptions he makes about each person's ability in the unknown quality e will average zero over a number of persons</emph>.</p><p> He refers to specification equations, and his trouble with them, in particular that they are <emph>true for all persons</emph>, using Robinson Crusoe as an analogy to show the problems with this premise. Ledermann has made brief marginal notes highlighting passages he agrees or disagrees with.</p><p> In the second letter, dated 20 Mar 1938 and numbered <emph>17a (38)</emph>, Thomson states that he was dissatisfied with his previous letter, but having had no time to attend to it he has enclosed it and sent it as it is.</p><p> He informs Ledermann that he will meet him in London, and encourages Ledermann to stay in London for as long as he wants. He refers briefly to Ledermann's correspondence with Paul Horst, as well as Thurstone's <emph>iterative process for finding commonalities</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-51" level="item"><did><unittitle>18 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/51<extptr href="1221"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">31 Mar 1938</unitdate><physloc id="aspace_d14f722a3a931c20e7d9813219e9c292">CLX-A-667</physloc><langmaterial id="aspace_f02b697de91933b916e57d9e8da27606">English</langmaterial></did><scopecontent id="aspace_2e971d9c5d0c5abd30dcd9a767e93ebc"><head>Scope and Contents</head><p>Thomson asks Ledermann for <emph>a simple explanation of how Thurstone rotates the axis to the position of simple structure</emph> for use in <title>The Factorial Analysis of Human Ability</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-52" level="item"><did><unittitle>19 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/52<extptr href="1222"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (8 leafs, 8 sides)</extent></physdesc><unitdate type="inclusive">31 Mar 1938</unitdate><physloc id="aspace_5e17de5e4170cab740553c158f717a2c">CLX-A-667</physloc><langmaterial id="aspace_c54ba3d99aa28d0ccc7f6eee0c07694c">English</langmaterial></did><scopecontent id="aspace_eb9bcdc3c15848f21381650ef9399ece"><head>Scope and Contents</head><p>Thomson asks Ledermann for his advice regarding his chapter on <emph>Boundary Conditions</emph>, specifically the rule <emph>that if the largest latent root comes between s and (s+1), then s-factors are inadequate</emph>, showing Ledermann the examples he is planning on using in the chapter. Ledermann has added answers to calculations in red pencil.</p><p> Thomson also asks Ledermann about Thurstone's <emph>iterative process for finding the commonalities</emph>, giving some examples.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-53" level="item"><did><unittitle>20 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/53<extptr href="1223"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">6 Apr 1938</unitdate><physloc id="aspace_a2820f51fe09bb33262e40ce29e1d8f5">CLX-A-667</physloc><langmaterial id="aspace_efe3835bd2500eb5ee8d49f5b0d616b1">English</langmaterial></did><scopecontent id="aspace_eb16c53f48ad30b175484de9a4659cff"><head>Scope and Contents</head><p>Thomson gives Ledermann instructions regarding a matrix and the centroid process.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-54" level="item"><did><unittitle>Reprint of Ledermann's piece, <title>A Shortened Method of Estimation of Mental Factors by Regression</title> from <title>Nature</title></unittitle><unitid>Coll-1064/54<extptr href="1224"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 leaf (1 side), badly damaged and torn</extent></physdesc><unitdate type="inclusive">9 Apr 1938</unitdate><physloc id="aspace_fc5bf7ea74c6a5ed8972a4010a743153">CLX-A-667</physloc><langmaterial id="aspace_d85ca224717706ae2db239e8ea58c891">English</langmaterial></did></c01><c01 id="aspace_Coll-1064-55" level="file"><did><unittitle>21 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/55<extptr href="1225"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (5 leafs, 6 sides); 1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">12 Apr 1938-21 May 1938</unitdate><physloc id="aspace_17483b8b71c238041f48dc0b8745e825">CLX-A-667</physloc><langmaterial id="aspace_2881c3284caed750911a5dcca30dc00f">English</langmaterial></did><scopecontent id="aspace_396fc1a19b3e59752ff7433867408161"><head>Scope and Contents</head><p>In the first letter, dated 12 Apr 1938 and numbered <emph>21 (38)</emph>, Thomson tells Ledermann about his trip to Dumfries and the Galloway coast, informing him of his travel plans for the next few weeks which include going to Munich and Vienna. He asks Ledermann to undertake editing work on <title>The Factorial Analysis of Human Ability</title>, in particular ensuring a second manuscript is up to date. Thomson also refers to the mathematical appendix he has completed and is sending on to Ledermann to ensure it is correct, and sends good wishes for Ledermann's tour.</p><p> In the second letter, dated 19 Apr 1938 and numbered <emph>21a (38)</emph>, Thomson informs Ledermann that he has sent the typed manuscripts of <title>the Factorial Analysis of Human Ability</title> to Moray House for him to pick up, and is currently getting the last chapter typed. He also refers to an unnamed cousin of Ledermann who is in some difficulty, and gives Ledermann the name of Sir Philip Hartog, who may be able to help him.</p><p> Also includes a postcard, dated 21 May 1938 and numbered <emph>21b (38)</emph>, in which Thomson tells Ledermann briefly about his travels in Czechoslovakia and Sweden, and the professors he met there, and lets him know when he will be in Glenapp.</p></scopecontent><controlaccess><geogname authfilenumber="geo_530" source="lcsh">London (England)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-56" level="item"><did><unittitle>22 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/56<extptr href="1226"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">25 May 1938</unitdate><physloc id="aspace_89b304d95e19765014fe81011008a34d">CLX-A-667</physloc><langmaterial id="aspace_0647042addf0a41fa77d0bfb63482ca5">English</langmaterial></did><scopecontent id="aspace_ef95adebacd1d6df9754b2732c791d89"><head>Scope and Contents</head><p>Thomson acknowledges receipt of the manuscript of <title>The Factorial Analysis of Human Ability</title> from Ledermann, thanks him for correcting and sending proofs to <title>the Journal of Educational Psychology</title> and <title>the British Journal of Psychology</title>, and asks him to ensure he has ordered off prints.</p><p> He refers briefly to the weather during his travels in Munich and Stockholm.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-57" level="file"><did><unittitle>23 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/57<extptr href="1227"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter, 2 postscripts (10 leafs, 10 sides)</extent></physdesc><unitdate type="inclusive">29 May 1938-30 May 1938</unitdate><physloc id="aspace_27cf4714abcb00bd3f2a701a0fd5357a">CLX-A-667</physloc><langmaterial id="aspace_7053cf00864f7924db1cef30be2f4f47">English</langmaterial></did><scopecontent id="aspace_1d187106a572c9eeae0e521c3fc504c6"><head>Scope and Contents</head><p>Contains short letter from Thomson thanking Ledermann for the return of a manuscript copy of <title>The Factorial Analysis of Human Ability</title>, and pointing out an error in his formula; a post script from Thomson regarding an error in Burt's matrix; and a post script from Thomson regarding Ledermann's notes about <emph>when a Heywood battery becomes impossible</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-58" level="item"><did><unittitle>24 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/58<extptr href="1228"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">1 Jun 1938</unitdate><physloc id="aspace_14b95c62dc9e63ce70113ae2c5ba8369">CLX-A-667</physloc><langmaterial id="aspace_7ba4cdb93dc0064c92331c966f95581f">English</langmaterial></did><scopecontent id="aspace_d6a393eced62a5b4d577d2f72732cea4"><head>Scope and Contents</head><p>Thomson refers to a formula Ledermann has confirmed is correct, and informs Ledermann the manuscripts, most likely for <title>The Factorial Analysis of Human Ability</title>, are almost ready to be sent off, which will allow Thomson to return to original research. He asks Ledermann about the progress of his thesis.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-59" level="item"><did><unittitle>25 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/59<extptr href="1229"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">8 Jun 1938</unitdate><physloc id="aspace_0f3c70ad9788cc5d2fa4f5ce21a35231">CLX-A-667</physloc><langmaterial id="aspace_b91c616ffb84bc53df4e9cad1fe0fb53">English</langmaterial></did><scopecontent id="aspace_848d8edc71af461b0bf95333ab65ebc8"><head>Scope and Contents</head><p>Thomson discusses the possibility of Ledermann applying for a temporary post at Swansea, and advises him to do so.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-60" level="item"><did><unittitle>26 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/60<extptr href="1230"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">10 Jun 1938</unitdate><physloc id="aspace_c33975041047a37adad1376d6923d742">CLX-A-667</physloc><langmaterial id="aspace_a043c34a9247bb691e6eff655d83be83">English</langmaterial></did><scopecontent id="aspace_e9032779e49a48290750cd4d8119e75e"><head>Scope and Contents</head><p>Thomson asks Ledermann to look at Thurstone's <title>Primary Mental Abilities</title> in order to check <emph>the covariances of the estimated factors</emph> with Thomson's own, and refers him to Thurstone's comments on Spearman's <emph>g</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-61" level="item"><did><unittitle>27 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/61<extptr href="1231"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">12 Jun 1938</unitdate><physloc id="aspace_6b5f0a54d25302b769ee772965e88971">CLX-A-667</physloc><langmaterial id="aspace_b6e4792d6098a91d33946ba5ff47e617">English</langmaterial></did><scopecontent id="aspace_dc92e340a962931e70863594fb9e21f1"><head>Scope and Contents</head><p>Thomson refers to Aitken, saying he will be interested to hear what he has to say about Ledermann's work on <emph>the connection between the formulae for selection of an infinite normal population and for the expected values in a sampling distribution</emph>.</p><p> He asks Ledermann to check section 2 of chapter 14 in <title>The Factorial Analysis of Human Ability</title> regarding simple structure, and asks him to clear up some difficulties he is having with Thurstone's <title>Primary Mental Abilities</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-62" level="item"><did><unittitle>28-29 (38), Ledermann's notes</unittitle><unitid>Coll-1064/62<extptr href="1232"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 set of notes (3 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">14 Jun 1938-15 Jun 1938</unitdate><physloc id="aspace_69f6e4da500c1414f1c9ef75421cb2a7">CLX-A-667</physloc><langmaterial id="aspace_086c92f1629cf6f492299267fd16dfd8">English</langmaterial></did><scopecontent id="aspace_25f44d2ba52cee9f737636153e0479e5"><head>Scope and Contents</head><p>Notes in Ledermann's hand titled <title>Professor Thomson's letters of Jun 14th and 15th on Distribution of Loadings</title>, which explores the distribution of loadings found in Thurstone's example in <title>Primary Mental Abilities</title>, illustrated with text and diagrams.</p><p> Ledermann also refers to an article by Woodrow from <title>the Journal of Educational Psychology</title>.</p></scopecontent></c01><c01 id="aspace_Coll-1064-63" level="item"><did><unittitle>30 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/63<extptr href="1233"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">17 Jun 1938</unitdate><physloc id="aspace_5c33a6f938a942ba33a95f64850b62dd">CLX-A-667</physloc><langmaterial id="aspace_93b36ce440c7fbb1e44fe419fe1fd6de">English</langmaterial></did><scopecontent id="aspace_27822963f617ca10e030028c03fa97a0"><head>Scope and Contents</head><p>Thomson asks Ledermann to find the latent roots of a matrix, which he reproduces, in order to check its <emph>principle axes</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-64" level="item"><did><unittitle>31 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/64<extptr href="1234"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">21 Jun 1938</unitdate><physloc id="aspace_34b6bde9a452f41497807db6d728bbe9">CLX-A-667</physloc><langmaterial id="aspace_767b5d630760b9c3b67f3a55fece0080">English</langmaterial></did><scopecontent id="aspace_c104bfb54918cf0e4b38d440bf18c40a"><head>Scope and Contents</head><p>Thomson compares the latent roots Ledermann has calculated with his own, referring to Hotelling's iterative process.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-65" level="file"><did><unittitle>32 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/65<extptr href="1235"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (4 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">25 Jun 1938-1 Jul 1938</unitdate><physloc id="aspace_77188c1ea14796ed81fc712d32dfd892">CLX-A-667</physloc><langmaterial id="aspace_feac904497f48c71b5c392d52b8efea3">English</langmaterial></did><scopecontent id="aspace_2d280f6fbde522d8207258a59412ff24"><head>Scope and Contents</head><p>In the first letter dated 25 Jun 1938, Thomson thanks Ledermann for his corrections. He discusses unimodality and bimodality, vectors, and the distributions of loadings, referring to the work of Thurstone and Woodrow, as well as Ledermann's own method for finding the distribution of loadings. He also asks Ledermann if he has heard anything about his Home Office application.</p><p> In the second later, dated 1 Jul 1938, Thomson asks Ledermann which part of the summer he is to have off, and discusses his <emph>analytical expression of the difference between profile correlations and partial correlations for mean score</emph>, referring to the work of Kelley and Thurstone. He also refers to profile correlations, stating that he doesn't quite understand them yet, but doesn't think Burt does either.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-66" level="file"><did><unittitle>33 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/66<extptr href="1236"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (7 leafs, 7 sides)</extent></physdesc><unitdate type="inclusive">26 Jun 1938-4 Jul 1938</unitdate><physloc id="aspace_4d1423ab38ac89be8dd1b83f51c3e2dc">CLX-A-667</physloc><langmaterial id="aspace_3b7f180e9219c5943f818abaca5b5038">English</langmaterial></did><scopecontent id="aspace_af293076b9eab2c2e7f40d269f572af1"><head>Scope and Contents</head><p>In the first letter, dated 26 Jun 1938, Thomson explains what he means by a <emph>profile correlation</emph>, and asks Ledermann to help him solve his difficulties with this, illustrating with matrices and calculations.</p><p> In the second letter, dated 4 Jul 1938, Thomson tells Ledermann that he is sorry to hear of his Father's accident, but hopes that he will enjoy the colloquium at St Andrews and visiting his Brother in Wales.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-67" level="item"><did><unittitle>Un-numbered copy of a letter from Ledermann to Thomson regarding a vacancy in St Andrews</unittitle><unitid>Coll-1064/67<extptr href="1237"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">15 Jul 1938</unitdate><physloc id="aspace_52bff3b864fbcb6d5d32fb9de31e8294">CLX-A-667</physloc><langmaterial id="aspace_66b010f0a3529d6bb9e13728c1cc1a39">English</langmaterial></did><scopecontent id="aspace_ba0492e3ddbb351985f051c5b010333f"><head>Scope and Contents</head><p>Ledermann tells Thomson about the job offer he has received from St Andrews, that of assistant lecturer. He expresses his regret that he will not have much time for research, particularly for work with Thomson, and hopes Thomson won't think him ungrateful. He asks Thomson for advice regarding the submission of his DSc, and lets him know that the condition attached to his permit allowing him to stay in the UK has been lifted by the Home Office.</p></scopecontent><controlaccess><geogname authfilenumber="geo_530" source="lcsh">London (England)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-68" level="file"><did><unittitle>34 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/68<extptr href="1238"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">28 Jun 1938-16 Jul 1938</unitdate><physloc id="aspace_5be46cdda09639953089a68b02105e3f">CLX-A-667</physloc><langmaterial id="aspace_70156df6935d86be9e5b8a57f6756603">English</langmaterial></did><scopecontent id="aspace_86498f456c429ebefc197eea9ff4ccb4"><head>Scope and Contents</head><p>In the first letter, dated 28 Jun 1938, Thomson discusses binomial distribution, referring to Thurstone's <title>Primary Mental Factors</title>. </p><p> In the second letter, dated 16 Jul 1938, Thomson congratulates Ledermann on his new post, telling him he will miss him but wishing him good luck. He advises him to speak to the Senate regarding his DSc and try to submit in December, and tells him he hopes they can still write to one another.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-69" level="item"><did><unittitle>35 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/69<extptr href="1239"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">26 Jul 1938</unitdate><physloc id="aspace_5f325b310b419683fd0eb73322a5a287">CLX-A-667</physloc><langmaterial id="aspace_9c2e1632c1e9fecbf5f0da289dce568c">English</langmaterial></did><scopecontent id="aspace_ce1ec0f7d40a9ec4418a8dbd33a07693"><head>Scope and Contents</head><p>Thomson mentions <title>Psychometrika</title> articles, though he does not give titles or dates. He refers to offprints for Ledermann's <emph>Univariate note</emph>, and for a <emph>multivariate</emph> piece, neither of which he has received the offprints for.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-70" level="item"><did><unittitle>36 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/70<extptr href="1240"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">6 Aug 1938</unitdate><physloc id="aspace_ea5259f92366109f4377fa45ceebf05f">CLX-A-667</physloc><langmaterial id="aspace_3eb2aa37b74192e05c4ffe7daff4970b">English</langmaterial></did><scopecontent id="aspace_77639ec62abaf312d27eb0d2a664768d"><head>Scope and Contents</head><p>Thomson informs Ledermann that he has received 25 offprints of his <title>British Journal of Psychology</title> article, and asks him to confirm that they ordered and paid for 150. He asks how Ledermann's father is.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-71" level="item"><did><unittitle>37 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/71<extptr href="1241"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters (2 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">6 Sept 1938</unitdate><physloc id="aspace_2c5311b6c6847e6ebb379013b7c21e1a">CLX-A-667</physloc><langmaterial id="aspace_40965d5407ba72c0be5c21e1582c8a2e">English</langmaterial></did><bioghist id="aspace_01c233bcdd339e884227151bfe1bceb5"><head>Biographical / Historical</head><p>Ledermann leaving for St Andrews meant an early termination of his research by one term, which affected his being able to submit the DSc to Edinburgh.</p></bioghist><scopecontent id="aspace_03ceb6550f548f0a37be30ac232278c2"><head>Scope and Contents</head><p>In the first letter, dated 6 Sept 1938 and numbered <emph>37 (38)</emph>, Thomson informs Ledermann of his plans for the next few weeks, which include going to London and to a Carnegie conference in Dinard. He reassures him that he will have an advocate in the Faculty of Science in Edmund Whittaker, and tells him he hopes the decision of the Senate with regards to his DSc will be a positive one. Thomson also asks Ledermann to send his <title>Note on Sampling Distribution</title> to him so he can read it, and remarks that Aitken found it interesting. </p><p> In the second letter, dated 11 Sept and numbered <emph>37a (38)</emph>, Thomson comments on Ledermann's manuscript, telling him he found it interesting, and refers to his use of the term <emph>correlational matrices</emph>. Thomson advises Ledermann that <title>Biometrika</title> would be a good place to publish, suggesting that Aitken might commend it to Egon Pearson. He informs Ledermann that any offprints can be paid for through the fund.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-72" level="item"><did><unittitle>Un-numbered copy of a letter from Ledermann to Thomson regarding Ledermann's DSc</unittitle><unitid>Coll-1064/72<extptr href="1242"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">21 Oct 1938</unitdate><physloc id="aspace_781c3d61f1056717b368f15f5fee7e0a">CLX-A-667</physloc><langmaterial id="aspace_ac9ca5e2190cbd79bed040e8d151c922">English</langmaterial></did><scopecontent id="aspace_ba8cb9132a6a5b8fc95a036495e442c8"><head>Scope and Contents</head><p>Ledermann expresses his disappointment at the decision by the faculty to refuse his DSc on the basis that he is leaving Edinburgh one term before his period of research has expired. He asks for Thomson's advice on the matter.</p><p> He also informs Thomson that his paper on <emph>sampling distribution</emph> is likely to be printed in <title>Biometrika</title>; and that an article he wrote titled <title>The Orthogonal Transformation of a Factorial Matrix into Itself</title> is to be published in <title>Psychometrika</title>.</p></scopecontent><controlaccess><geogname authfilenumber="758" source="local">St Andrews (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-73" level="item"><did><unittitle>38 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/73<extptr href="1243"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">22 Oct 1938</unitdate><physloc id="aspace_eaa69d7145e79a5be7a9d660c4d135af">CLX-A-667</physloc><langmaterial id="aspace_ea86778a5441a08e40d2e2f6d13a97e3">English</langmaterial></did><scopecontent id="aspace_27f2f6be705e5576ad5e53da0ea46a69"><head>Scope and Contents</head><p>Thomson expresses his disappointment over the decision of the Faculty of Science not allowing Ledermann to submit his DSc. He encourages him to speak to staff at St Andrews and make a formal application, and tells him he will speak to both Edinburgh University and St Andrews University if this is unsuccessful.</p><p> Thomson comments that C Spearman has written an <emph>Anti-Thomson</emph> article in <title>the British Journal of Psychology</title>, and tells him that <title>The Factorial Analysis of Human Ability</title> should be published very soon. He comments that Ledermann must have had an anxious time in the last few months, and enquires as to how his family are in Palestine.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-74" level="item"><did><unittitle>39 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/74<extptr href="1244"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">31 Oct 1938</unitdate><physloc id="aspace_6b629952363e7435a0a150c9b9bc7971">CLX-A-667</physloc><langmaterial id="aspace_5f680ca4e7b3d9522c922a0c417c3806">English</langmaterial></did><scopecontent id="aspace_8b1ae58542b5c59fd6c4e2e38bcb368b"><head>Scope and Contents</head><p>Thomson informs Ledermann that Ledermann's two articles, <title>The Orthogonal Transformation of a Factorial Matrix into Itself</title> and <title>On a Shortened Method of Estimation of Mental Factors by Regression</title> have been accepted for publication in <title>Psychometrika</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-75" level="item"><did><unittitle>40 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/75<extptr href="1245"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">25 Nov 1938</unitdate><physloc id="aspace_799f41a7cc92d2c498687964f500607a">CLX-A-667</physloc><langmaterial id="aspace_4f35661071337cffb4f7da2356a6d6ff">English</langmaterial></did><scopecontent id="aspace_a6c19001e1be04e9b7b753c7bed3bc7d"><head>Scope and Contents</head><p>Thomson asks Ledermann if he will look at Burt's article, <title>The Unit Hierarchy and its Properties</title>, and give his opinion. He also refers to the work of Ledyard R Tucker, and Aitken. He informs Ledermann that he will hopefully have the services of Lawley as Ledermann's replacement.</p><p> Thomson and asks Ledermann if his family are OK, telling him they are in his thoughts.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-76" level="item"><did><unittitle>41 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/76<extptr href="1246"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">6 Dec 1938</unitdate><physloc id="aspace_a6a9a882bb04a13d3d6bd2e1dc13fa0e">CLX-A-667</physloc><langmaterial id="aspace_108525ca915c8998482103c2c705a864">English</langmaterial></did><scopecontent id="aspace_01ffb6a28d524f36b2c5e69f9c219e59"><head>Scope and Contents</head><p>Thomson tells Ledermann how glad he is to hear that Ledermann's parents and sister have arrived safely in London. He informs him that his successor, D N Lawley, has started, and that he will meet him at the meeting of the Mathematical Association or Society of Edinburgh.</p><p> Thomson assures Ledermann that they will talk over his DSc next time they meet, and that he is thinking over what is best to do.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-77" level="item"><did><unittitle>42 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/77<extptr href="1247"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">17 Dec 1938</unitdate><physloc id="aspace_3f5506139a6707531690f5579dda59bc">CLX-A-667</physloc><langmaterial id="aspace_fb433738d9970c48c4f59a9e60bfa47e">English</langmaterial></did><scopecontent id="aspace_8c07dc0f4e605147c848429a522cf814"><head>Scope and Contents</head><p>Thomson refers briefly to offprints of Ledermann's <title>Biometrika</title> article. He advises Ledermann not to overwork himself in preparing his lectures at the cost of sleep or original research.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-78" level="item"><did><unittitle>43 (38), Thomson to Ledermann</unittitle><unitid>Coll-1064/78<extptr href="1248"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 sides)</extent></physdesc><unitdate type="inclusive">19 Dec 1938</unitdate><physloc id="aspace_a0d45f0f682bac149aac07662f72ae9e">CLX-A-667</physloc><langmaterial id="aspace_71ee11fad73f025b71fe520cc005b1c1">English</langmaterial></did><scopecontent id="aspace_d293863d77c5609beaa0e2868f1e4392"><head>Scope and Contents</head><p>Thomson refers to the list of books in Ledermann's possession funded by the Carnegie Grant. The list has not survived in the collection, but Thomson advises Ledermann that he may want works of Thurstone, Alexander, and Holzinger to give to a PhD student the following term.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-79" level="file"><did><unittitle>Material regarding Bartlett's theory of estimating mental factors</unittitle><unitid>Coll-1064/79<extptr href="1249"/></unitid><origination label="Creator"><persname authfilenumber="per_3265" source="local">Bartlett, Maurice Stevenson, 1910-2002 (statistician)</persname></origination><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">11 leafs (11 sides)</extent></physdesc><unitdate normal="1938/1938" type="inclusive">1938</unitdate><physloc id="aspace_56583c88edfcfc3078f2687f5f344a2f">CLX-A-667</physloc><langmaterial id="aspace_71201ebd495ad30c59b9eef19d432cdf">English</langmaterial></did><scopecontent id="aspace_471496aa7c837be426bee167ceba1a7b"><head>Scope and Contents</head><p>Includes a reprint of Thomson's letter titled <title>Methods of Estimating Mental Factors</title> from <title>Nature</title>, vol. 141, (Feb 1938), 246; a handwritten copy of Thomson's manuscript in Ledermann's hand titled <title>Copy of Professor Thomson's M S on regression and Bartlett's estimates</title>; and a typed copy of a letter from Bartlett to Thomson in which argues that neither he nor Thomson are right and the other wrong, but rather that both of their methods are valid under the right circumstances.</p></scopecontent></c01><c01 id="aspace_Coll-1064-80" level="item"><did><unittitle>Copy of an un-numbered letter from Ledermann to Thomson regarding his DSc</unittitle><unitid>Coll-1064/80<extptr href="1250"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">4 Dec 1938</unitdate><physloc id="aspace_4f9f7fb7c8e3e607042931ee916e8d52">CLX-A-667</physloc><langmaterial id="aspace_eb32384a3c40a09057b2502b3aa93bc4">English</langmaterial></did><scopecontent id="aspace_480bfada7363def08d7d0b5d78efd28e"><head>Scope and Contents</head><p>Ledermann informs Thomson that Professor Turnbull of St Andrews has advised him against taking any action regarding his DSc degree at St Andrews. Ledermann asks Thomson if he can do anything to help matters in Edinburgh, such as pointing out that Ledermann had begun working for Thomson before his period of research officially started.</p><p> He also mentions that he has received proofs of his article from <title>Biometrika</title>, and informs Thomson that his parents and younger sister are now in London.</p></scopecontent><controlaccess><geogname authfilenumber="758" source="local">St Andrews (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-81" level="item"><did><unittitle>1 (39), Ledermann to Thomson, and Thomson to Ledermann</unittitle><unitid>Coll-1064/81<extptr href="1251"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letter (2 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">25 Apr 1939-26 Apr 1939</unitdate><physloc id="aspace_0853903f45a3b9e8966d867e4327667e">CLX-A-667</physloc><langmaterial id="aspace_cfa22da314c6bb4cd595d0c5bb79626c">English</langmaterial></did><scopecontent id="aspace_5d804787603e12cb677b52087b42b068"><head>Scope and Contents</head><p>In Ledermann's letter to Thomson, dated 25 Apr 1939, he informs Thomson of his applying for the Carnegie Teaching Fellowship, which would allow him to undertake original research in the areas of <emph>pure matrix algebra and abstract group theory</emph>. He also mentions that he would like to devote some time to applied mathematics, specifically factor analysis, and asks Thomson for permission to continue the work he undertook as Thomson's assistant, perhaps with the help of Lawley.</p><p> In Thomson's reply, dated 26 Apr 1939, he tells Ledermann how pleased he is at the possibility of Ledermann's teaching fellowship and of him continuing work on factor analysis.</p></scopecontent><controlaccess><geogname authfilenumber="758" source="local">St Andrews (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-82" level="item"><did><unittitle>2 (39), Thomson to Ledermann, Ledermann to Thomson</unittitle><unitid>Coll-1064/82<extptr href="1252"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">19 Jun 1939-24 Jun 1939</unitdate><physloc id="aspace_0dfeb73ee08381978d4def34e265beb8">CLX-A-667</physloc><langmaterial id="aspace_2d66b796993e586a96eb767b736b360b">English</langmaterial></did><scopecontent id="aspace_a419880424766e9296b56927b66461f8"><head>Scope and Contents</head><p>In Thomson's letter to Ledermann, dated 19 Jun 1939, he apologises for not replying to an earlier letter of Ledermann's and informs him that he will be happy to send him any of the letters he has written regarding his work from the last year, asking him to specify the subjects he is interested in.</p><p> In his reply, dated 24 Jun 1939, Ledermann tells Thomson that he would like to look at the problem of <emph>maximising and minimizing the specifics</emph>, and that he has not managed to progress much with W G Madow's paper on <emph>multivariate statistical analysis</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_530" source="lcsh">London (England)</geogname><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-83" level="item"><did><unittitle>3 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/83<extptr href="1253"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">4 Jul 1939</unitdate><physloc id="aspace_f02696ee5fc1e16af392961d83f652e3">CLX-A-667</physloc><langmaterial id="aspace_4ad8c29968663fde5a7081db28b0babe">English</langmaterial></did><scopecontent id="aspace_37c7dab47c895bd810271f31fa13d3fd"><head>Scope and Contents</head><p>Thomson refers to manuscripts he has enclosed regarding <emph>minimum rank and trace</emph>. These have not survived in the collection.</p><p> Thomson mentions the inclusion of Ledermann's article in the current edition of <title>Psychometrika</title>; informs him of the 12th International Congress of Psychologists to be held in Edinburgh, pointing out that there is to be half a day devoted to factor analysis; and tells him he has noticed a misprint in <title>The Factorial Analysis of Human Ability</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-84" level="item"><did><unittitle>4 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/84<extptr href="1254"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (4 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">1 Aug 1939</unitdate><physloc id="aspace_856b5b197ffc9d67856d182ce4de67b1">CLX-A-667</physloc><langmaterial id="aspace_0554a65832f12760fc221faf46b12311">English</langmaterial></did><scopecontent id="aspace_5cb186140e5c2f5e217bbc82a3f931ad"><head>Scope and Contents</head><p>Thomson informs Ledermann that he has read through his paper and recommends the Edinburgh Royal Society as the best place to try for publication. He refers to a misprint in Ledermann's manuscript and offers a correction.</p><p> Thomson asks Ledermann if he still has the calculating machine, and if it would be possible for him to undertake some calculations for an experiment in Scotland regarding performance tests, and referring to Thurstone's centroid analysis. He assures him that any work undertaken will be paid for.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-85" level="item"><did><unittitle>5 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/85<extptr href="1255"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">10 Aug 1939</unitdate><physloc id="aspace_5c63141079aec2577fc8efdf1812e7e9">CLX-A-667</physloc><langmaterial id="aspace_a76ee3bf173ea78f2a4c22bf5bc27dc0">English</langmaterial></did><scopecontent id="aspace_9569359945c356d52614ca57fa95bf20"><head>Scope and Contents</head><p>Thomson advises Ledermann on how he can shorten his manuscript, and offers to send it to the Royal Society in Edinburgh.</p><p> Thomson discusses the calculations referred to in his previous letter, suggesting that <emph>Mr Kendal of the Agricultural and Fishes</emph> may be able to help. He informs Ledermann that the calculations are <emph>two Thurstone centroid analyses, one on 441 boys, the other on 430 girls</emph>, all Scottish children born on the 1st of Feb, May, Aug, and Nov of 1926.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-86" level="item"><did><unittitle>6 (39), Ledermann to Thomson</unittitle><unitid>Coll-1064/86<extptr href="1256"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">14 Aug 1939</unitdate><physloc id="aspace_c85d4383dd4d34897a4b838e7dce3837">CLX-A-667</physloc><langmaterial id="aspace_e0fefb70fad404ff0c0c096dd3bde59e">English</langmaterial></did><scopecontent id="aspace_c4a08350eb8b6bb15c591eec85ed081e"><head>Scope and Contents</head><p>Thomson asks Ledermann to do nothing for the time being with the calculations referred to in his previous correspondence, since he thinks there are potential discrepancies to be checked beforehand.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-87" level="item"><did><unittitle>7 (39), Ledermann to Thomson</unittitle><unitid>Coll-1064/87<extptr href="1257"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">24 Aug 1939</unitdate><physloc id="aspace_6273a179d4e754a1076250afc8a87a5a">CLX-A-667</physloc><langmaterial id="aspace_ed7372c5ed4de990e6c8969f91743753">English</langmaterial></did><scopecontent id="aspace_2edbb7db00e305615fd3e25660f9812e"><head>Scope and Contents</head><p>Thomson tells Ledermann he is glad Dr Comrie [?] is interested in the work referred to in his previous letters regarding children born in Scotland on the 1st of Feb, May, Aug, and Nov of 1926, but mentions again that errors in the original calculations mean the further calculations to be undertaken will have to be postponed.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-88" level="item"><did><unittitle>8 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/88<extptr href="1258"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 sides)</extent></physdesc><unitdate type="inclusive">21 Sept 1939</unitdate><physloc id="aspace_565d59c81033875a47913f9865fc299c">CLX-A-667</physloc><langmaterial id="aspace_0dc896a99279ae745a01c04c39e6c691">English</langmaterial></did><scopecontent id="aspace_f106da7294381531356486290cb6d739"><head>Scope and Contents</head><p>Thomson thanks Ledermann for <emph>the sheets</emph>, though concludes they were not of great value. He refers to <emph>trying times</emph>, sending Ledermann good wishes and stating that they will pass.</p><p> He informs Ledermann that he almost has the calculations accurate, which will allow for the further analysis discussed in previous letters. He tells Ledermann about Hector's travels in Cyprus studying Byzantine buildings, confiding that he isn't sure where he is now, but thinks he is possibly in the Eastern Mediterranean.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-89" level="item"><did><unittitle>10 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/89<extptr href="1259"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">11 Oct 1939</unitdate><physloc id="aspace_c2e531afeec031daa859741861ba1223">CLX-A-667</physloc><langmaterial id="aspace_da9e19eef6c7e5ca511efabe5b03a84f">English</langmaterial></did><scopecontent id="aspace_ef58d7271d609e1f9678e5ea2a7d30e1"><head>Scope and Contents</head><p>Thomson discusses his difficulties in retrieving offprints from Customs House at Leith.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-90" level="item"><did><unittitle>11 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/90<extptr href="1260"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (5 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">28 Oct 1939</unitdate><physloc id="aspace_399747326b97fe89ad29f0911cc36df2">CLX-A-667</physloc><langmaterial id="aspace_aed08e8d19d61cac30303d7543ed0d3b">English</langmaterial></did><scopecontent id="aspace_074f943104fb6d5efd96ca56bf0a45e2"><head>Scope and Contents</head><p>Thomson suggests Ledermann's new address means he has now found a house, and wishes he and his parents happiness. He asks him to send on the <title>Psychometrika</title> offprints.</p><p> He refers Ledermann to two papers by E B Wilson and Jane Worcester respectively in the <title>Proceedings of the National Academy of Sciences</title>, in particular drawing his attention to their use of a Thurstone formula, and suggests Ledermann might want to pursue the matter further. He asks Ledermann if he ever manages to get to Edinburgh, and suggests he might help him get a permit if necessary. </p><p> Also includes a page of incomplete notes regarding intelligence tests with reference to <emph>the Minnesota book</emph> and Hotelling's <emph>most predictable criterion</emph>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-91" level="item"><did><unittitle>12 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/91<extptr href="1261"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">2 letters, (4 leafs, 4 sides)</extent></physdesc><unitdate type="inclusive">28 Oct 1939-Nov 15 1939</unitdate><physloc id="aspace_a76bc0a603af6e58b14091080e2e0048">CLX-A-667</physloc><langmaterial id="aspace_a6e1782ffebdb2a8c17c372ee07901a5">English</langmaterial></did><scopecontent id="aspace_11e65468f3c64daec9007e623ddae2c1"><head>Scope and Contents</head><p>In the first letter, dated 28 Oct 1939 and numbered <emph>12 (39)</emph>, Thomson refers to Ledermann's manuscript, which he had originally enclosed with some deletions suggested by a referee. These have not survived in the collection. He tells Ledermann that he is unsure if Professor Kendall will apply for a Carnegie Grant, or if Thomson or Ledermann will have to.</p><p> In the second letter, dated 15 Nov 1939 and numbered <emph>12 a (39)</emph>, Thomson invites Ledermann to tea and refers him again to the articles by E B Wilson and Jane Worcester, in particular two matrices of loadings which they use and which Thomson transcribes. He informs Ledermann that his son, Hector Thomson, will be continuing with his work in Nicosia.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-92" level="item"><did><unittitle>13 (39), Thomson to Ledermann</unittitle><unitid>Coll-1064/92<extptr href="1262"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">5 Dec 1939</unitdate><physloc id="aspace_095c0df774bc45aac4452d669338b901">CLX-A-667</physloc><langmaterial id="aspace_341391b6ecbc4dfbc95c0a8f2f066ab4">English</langmaterial></did><scopecontent id="aspace_b4186aa921723accd3364811f47d72e5"><head>Scope and Contents</head><p>Short letter in which Thomson reminds Ledermann to order 150 offprints of Ledermann's article, which the research fund will pay for.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-93" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann in which he wishes Ledermann a happy new year</unittitle><unitid>Coll-1064/93<extptr href="1263"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">8 Jan 1940</unitdate><physloc id="aspace_26667dc13fcd1f56c171080a266704aa">CLX-A-667</physloc><langmaterial id="aspace_856c1579893357fa6f3c8a221796691c">English</langmaterial></did><scopecontent id="aspace_7585ba40cce7a5ee8225e0044867f349"><head>Scope and Contents</head><p>Thomson tells Ledermann that he will be opening a discussion regarding Cyril Burt's <title>The Factors of the Mind</title> for the next meeting of <emph>the Factorial Club</emph>, and he ends by saying that he hopes 1941 will be a better year than 1940.</p><p> The letter is written on the reverse of a preliminary notice for the Twelfth International Congress of Psychology.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-94" level="item"><did><unittitle>1 (40), Thomson to Ledermann</unittitle><unitid>Coll-1064/94<extptr href="1264"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">30 Jan 1940</unitdate><physloc id="aspace_af7b7da8c69d507731f8ddcb50204e44">CLX-A-667</physloc><langmaterial id="aspace_8e4db742b407d2d82bf1c11db108b4e2">English</langmaterial></did><scopecontent id="aspace_765d8fa2e39d62613f1834db2a5654d9"><head>Scope and Contents</head><p>Thomson invites Ledermann to dinner.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-95" level="item"><did><unittitle>2 (40), Thomson to Ledermann</unittitle><unitid>Coll-1064/95<extptr href="1265"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">16 Feb 1940</unitdate><physloc id="aspace_6288c42551449d7509d3eb5ff5f8f1b4">CLX-A-667</physloc><langmaterial id="aspace_b809fcd8fb59387bd8b84c3cf82879c5">English</langmaterial></did><scopecontent id="aspace_947b195975ed3d796e3be28d5eda29fb"><head>Scope and Contents</head><p>Thomson compliments Ledermann's article in <title>Proceedings of the Royal Society of Edinburgh</title>, but points out what he thinks is a misprint.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-96" level="item"><did><unittitle>3 (40), Thomson to Ledermann</unittitle><unitid>Coll-1064/96<extptr href="1266"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">26 Feb 1940</unitdate><physloc id="aspace_a0b4061d38328fc3e5fe0ce32583d3c0">CLX-A-667</physloc><langmaterial id="aspace_92a058cf5b0bc628fc7c554a98027fa0">English</langmaterial></did><scopecontent id="aspace_39dc9276dc2139101530270f9c019e1f"><head>Scope and Contents</head><p>Ledermann asks Thomson to stop by his office when he visits Moray House so he can be introduced to James Duff.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-97" level="item"><did><unittitle>Un-numbered letter in which Thomson tells Ledermann how glad he is that he is now a naturalised British subject</unittitle><unitid>Coll-1064/97<extptr href="1267"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">16 Apr 1940</unitdate><physloc id="aspace_7f0c8615b39cfc77fe847ab4b87c407b">CLX-A-667</physloc><langmaterial id="aspace_42126715b8ee662f49b4121b65609d9b">English</langmaterial></did><scopecontent id="aspace_bffc98e9aec7ae97d126e83fa9cb41c9"><head>Scope and Contents</head><p>Thomson also reflects on the war, and sends his regards to Ledermann's parents.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-98" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann thanking him for sending a copy of his thesis and congratulating him on his doctorate</unittitle><unitid>Coll-1064/98<extptr href="1268"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">24 Jun 1940</unitdate><physloc id="aspace_422ae16147766729d771017ec7170d37">CLX-A-667</physloc><langmaterial id="aspace_7136af882de1c6e297b0119ff8d9e630">English</langmaterial></did><scopecontent id="aspace_4d8fa201d219cf72df2029773a20cd9d"><head>Scope and Contents</head><p>Thomson also apologises for being unable to attend the ceremony, and refers to Ledermann having to split his home up.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-99" level="item"><did><unittitle>Un-numbered letter in which Thomson expresses his pleasure at hearing Ledermann is to be an external examiner for a PhD thesis, and asks him to take part in meetings about mental testing</unittitle><unitid>Coll-1064/99<extptr href="1269"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">12 Nov 1940</unitdate><physloc id="aspace_17334ec23269fe05dd7651b086d03250">CLX-A-667</physloc><langmaterial id="aspace_19748d932b622a86e7007004d538cdfc">English</langmaterial></did><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-100" level="file"><did><unittitle>Material regarding Thomson's review of Cyril Burt's <title>The Factors of the Mind</title> in <title>Occupational Psychology</title>, and <title>the British Journal of Psychology</title></unittitle><unitid>Coll-1064/100<extptr href="1270"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">22 leafs (37 sides)</extent></physdesc><unitdate type="inclusive">Jan 1941-Aug 1941</unitdate><physloc id="aspace_7a19a31827d2c3d061c301d6fa159f76">CLX-A-667</physloc><langmaterial id="aspace_b0627437526035528d82bb5da44128f5">English</langmaterial></did><scopecontent id="aspace_5b5d124267da07fc21b14631a2c8fdad"><head>Scope and Contents</head><p>Includes handwritten draft of Thomson's review; letter from Thomson to Burt regarding the work of H D Wing; typescript notes; typed extract of Thomson's review from <title>Occupational Psychology</title>; and typed and handwritten notes by Thomson.</p></scopecontent></c01><c01 id="aspace_Coll-1064-101" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding a meeting of the Factorial Club</unittitle><unitid>Coll-1064/101<extptr href="1271"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (14 leafs, 14 sides)</extent></physdesc><unitdate type="inclusive">21 Jan 1941</unitdate><physloc id="aspace_d51ec08afdb2ec8f52c2f694f511780f">CLX-A-667</physloc><langmaterial id="aspace_318184029492be9918173860fc355645">English</langmaterial></did><scopecontent id="aspace_45b8fd241e0d38cc1b17bf2e5dc0216b"><head>Scope and Contents</head><p>Thomson tells Ledermann how glad he is that he will be attending the meeting, since he wants to discuss some difficulties he is having with Burt's work, particularly <emph>his reciprocity of tests and persons</emph>. He outlines these difficulties with several pages of explanatory working. </p><p> Written on the back of several copies of the preliminary notice for the twelfth International Congress of Psychology.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-102" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding <emph>table 5</emph></unittitle><unitid>Coll-1064/102<extptr href="1272"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (6 leafs, 6 sides)</extent></physdesc><unitdate type="inclusive">12 Feb 1941</unitdate><physloc id="aspace_050c1e20181a99667e066ce4f7d02cf0">CLX-A-667</physloc><langmaterial id="aspace_309280f85d154ea2d04249b149f92961">English</langmaterial></did><scopecontent id="aspace_ac041e6166b699041d175a8827d72417"><head>Scope and Contents</head><p>The table to which Thomson refers possibly comes from Burt's <title>The Factors of the Mind</title>. Thomson discusses the table at length, illustrating with calculations and matrices throughout.</p><p> Written on the back of several copies of the preliminary notice for the twelfth International Congress of Psychology.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-103" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding <emph>near-reciprocity</emph></unittitle><unitid>Coll-1064/103<extptr href="1273"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">2 Mar 1941</unitdate><physloc id="aspace_5894a64901f861c83fb2b2b74c852b49">CLX-A-667</physloc><langmaterial id="aspace_24b13a78af793e79273ae4aca7cc5bec">English</langmaterial></did><scopecontent id="aspace_2e4db3c16f952be428b613c03a977af9"><head>Scope and Contents</head><p>Thomson mentions a paper of <emph>Mr Hardie's</emph> and indicates that he would like to discuss this with Ledermann.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-104" level="item"><did><unittitle>Un-numbered postcard from Thomson to Ledermann thanking him for his birthday card and informing him of his son Hector Thomson's engagement</unittitle><unitid>Coll-1064/104<extptr href="1274"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 postcard (2 sides)</extent></physdesc><unitdate type="inclusive">30 Mar 1941</unitdate><physloc id="aspace_62ee1eb828ce650320fd1456cb30068e">CLX-A-667</physloc><langmaterial id="aspace_030cccab8b2ce33f5475095d281d30c4">English</langmaterial></did><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-105" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann in which he asks him to take part in a lecture regarding factorial analysis</unittitle><unitid>Coll-1064/105<extptr href="1275"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">12 Nov 1941</unitdate><physloc id="aspace_68cbed7478d24657cb7ea1c6233485ce">CLX-A-667</physloc><langmaterial id="aspace_96a1b1c61c6f117062d0229b283918c1">English</langmaterial></did><scopecontent id="aspace_b8b654010e6d71bfe6b2c4498cfd6ba1"><head>Scope and Contents</head><p>Thomson informs Ledermann he will be speaking about their work on Factorial Analysis at a meeting of the Royal Society [of Edinburgh]. He asks Ledermann if he will also take part, along with Lawley.</p><p> Thomson stresses that, although the lectures are to be delivered to scientists, the scientific audience come from varied backgrounds, and as such the lectures should be easily understood.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-106" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann in which he wishes Ledermann and his family a happy Christmas</unittitle><unitid>Coll-1064/106<extptr href="1276"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides), 2 typescripts (4pp, 3pp)</extent></physdesc><unitdate type="inclusive">18 Dec 1941</unitdate><physloc id="aspace_4ba5860848bf60eb0446693f6e0f0355">CLX-A-667</physloc><langmaterial id="aspace_f8a6911b4d27120cac42fb4a88aa8c3d">English</langmaterial></did><scopecontent id="aspace_bf6f953c556557bb946ed8e249a3647b"><head>Scope and Contents</head><p>Thomson remarks on a paper of Ledermann, highlighting corrections, and advises him with regards to slides for his Royal Society [of Edinburgh] lecture mentioned in his previous letter.</p><p> Also includes two sets of typescript notes titled <title>Positive Structure in Factorial Analysis</title> and <title>Geometrical Illustrations of Factors and Correlations</title>, most likely relating to the aforementioned lecture.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-107" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding a Hotelling review in <title>Science</title></unittitle><unitid>Coll-1064/107<extptr href="1277"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">9 Jul 1942</unitdate><physloc id="aspace_bc847c28f668ae6632eb412f7a0d08f7">CLX-A-667</physloc><langmaterial id="aspace_10fd5d3912e069e37d2857a5ff0103fd">English</langmaterial></did><scopecontent id="aspace_1d6cb6e85ffaacfcdadec6f2d2958bdb"><head>Scope and Contents</head><p>Thomson asks Ledermann what he thinks of the review, and asks him to pass it onto Derrick Lawley. He refers to Ledermann's sisters who are in Palestine, and hopes all is well.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-108" level="item"><did><unittitle>Papers regarding G Herdan's article, <title>The Factorization of Political Economy</title></unittitle><unitid>Coll-1064/108<extptr href="1278"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">9 leafs (9 sides)</extent></physdesc><unitdate type="inclusive">18 Aug 1942</unitdate><physloc id="aspace_32cfa581e0892571891b63b1dc070c30">CLX-A-667</physloc><langmaterial id="aspace_7a7f50021ecaf87e3f6ae5f3d8e7c8dd">English</langmaterial></did><scopecontent id="aspace_f653bcce8f2cedbe5614be489c2ad31c"><head>Scope and Contents</head><p>Includes typescript copy of a letter from Thomson to Herdan regarding the article, specifically the way in which Herdan has applied sampling theory to his data, and a typescript copy of Herdan's reply.</p><p> Includes two typescripts of Thomson's review of the article.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-109" level="item"><did><unittitle>Typescript of a problem for a meeting of the Factorial Club</unittitle><unitid>Coll-1064/109<extptr href="1279"/></unitid><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 typescript (2 leafs, 2 sides)</extent></physdesc><unitdate type="inclusive">Oct 1942</unitdate><physloc id="aspace_706d890589f4d6471c01e24dc1c27920">CLX-A-667</physloc><langmaterial id="aspace_174b33d506ebefa8fe829e98381c13c9">English</langmaterial></did><scopecontent id="aspace_12cfbc6abc9f0810326e7d62eafc94c8"><head>Scope and Contents</head><p>The problem regards <emph>general and <emph>type</emph> factors of aesthetic appreciation</emph>, as well as the <emph>possibilities of the method of analysis for general problems of person correlation</emph>.</p></scopecontent></c01><c01 id="aspace_Coll-1064-110" level="file"><did><unittitle>Typescript of Thomson's lecture for the Royal Society of Edinburgh titled <title>Factorial Analysis of Human Ability</title></unittitle><unitid>Coll-1064/110<extptr href="1280"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 note (1 leaf, 1 side); 1 typescript (10 leafs, 10 sides)</extent></physdesc><unitdate type="inclusive">13 Dec 1942</unitdate><physloc id="aspace_6f40698d97d5206fa646248c2f695ae7">CLX-A-667</physloc><langmaterial id="aspace_9481d5662966dad04b73392cb3eb2f78">English</langmaterial></did><scopecontent id="aspace_8c6a91cccda0192ebaf41a6064990c50"><head>Scope and Contents</head><p>Also includes a note from Thomson to Ledermann wishing him a happy Christmas and New Year.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-111" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding the formula <emph>number of common elements divided by the geometrical mean of the two totals</emph></unittitle><unitid>Coll-1064/111<extptr href="1281"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leafs, 14 sides); 1 slip (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">11 Jan 1943</unitdate><physloc id="aspace_e577edb5b0af95c8c871a869415afe82">CLX-A-667</physloc><langmaterial id="aspace_4cdd2e18f211ae3e6a908cd42214cd53">English</langmaterial></did><scopecontent id="aspace_b6199bdf939b0a3ba95bb876c4ceaf3d"><head>Scope and Contents</head><p>Thomson also wishes Ledermann and his family a Happy New Year, and asks Ledermann about the university examinations process in Germany, telling him of his own experience.</p><p> Thomson discusses dice throwing, referring to his own article, <title>a Hierarchy without a General Factor</title>, from <title>the British Journal of Psychology</title>, and his own experiments with dice.</p><p> The letter is written on the back of several tables and graphs regarding intelligence. It is unclear which report or article these are from, but they feature titles including <title>Reading and Spelling: differences in mean AQ for LE and RE boys and girls</title>; <title>Reading Accomplishment in association with Incidence of Left-and Right-eye dominancy</title>; <title>Distribution of IQs in association with incidence of Left- and Right eye Dominancy</title>; and <title>Percentages of Total Retarded Group in Categories of Accomplishment and Intelligence</title>.</p><p> Also includes a note from Derrick Lawley indicating he is returning the letter to Ledermann after Ledermann forgot it.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-112" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding the forthcoming edition of <title>The Factorial Analysis of Human Ability</title></unittitle><unitid>Coll-1064/112<extptr href="1282"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (2 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">29 Jun 1945</unitdate><physloc id="aspace_005a0adcc07bd7e92fc2d996ca417f94">CLX-A-667</physloc><langmaterial id="aspace_e86595e2e770db1e1bc91c7fae9e1a74">English</langmaterial></did><scopecontent id="aspace_26631163dab09e0b16ccee159ec14f98"><head>Scope and Contents</head><p>Thomson begins by telling Ledermann he has sent his reference to Professor Goldsborough, and hopes this has an influence on his chances.</p><p> He informs Ledermann that he is working on a new edition of <title>The Factorial Analysis of Human Ability</title>, and accordingly asks him about <emph>oblique factors</emph>, and <emph>oblique <emph>reference vectors</emph> </emph>, referring to the work of Thurstone.</p><p> Thomson ends the letter by wishing Ledermann good luck in his job search.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-113" level="item"><did><unittitle>Un-numbered letter from Ledermann to Thomson regarding Ledermann's <emph>criterion for simple structure</emph></unittitle><unitid>Coll-1064/113<extptr href="1283"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 5 sides)</extent></physdesc><unitdate type="inclusive">13 Jul 1945</unitdate><physloc id="aspace_ea2652a84e127ee92428bece8087c6dc">CLX-A-667</physloc><langmaterial id="aspace_cf42118ca05667759fe6219571a5b19b">English</langmaterial></did><scopecontent id="aspace_18f8ee1c4715e8b6fe597d7bc7098e64"><head>Scope and Contents</head><p>Ledermann refers to oblique reference vectors; his article, <title>Some Mathematical Remarks concerning Boundary Conditions</title> from <title>Psychometrika</title>, and the work of Thurstone. He illustrates his points with several pages of calculations, working, and explanatory notes.</p></scopecontent></c01><c01 id="aspace_Coll-1064-114" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding Ledermann's <emph>criterion for simple structure</emph></unittitle><unitid>Coll-1064/114<extptr href="1284"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (5 leafs, 10 sides)</extent></physdesc><unitdate type="inclusive">17 Jul 1945</unitdate><physloc id="aspace_e143883d87d8acb732dae1f15670c844">CLX-A-667</physloc><langmaterial id="aspace_e33cac93590303a9f6cfce7bdb5b7b70">English</langmaterial></did><scopecontent id="aspace_6e91a7decb649110b5c035a4f7deb47a"><head>Scope and Contents</head><p>Thomson thanks Ledermann for his letter, and asks him to clarify some points for him. He refers to <emph>Thurstone's way of finding simple structure</emph>, and discusses <emph>reference vectors</emph> and <emph>primary factors</emph> at length. </p><p> Thomson also asks Ledermann if his post at St Andrews is coming to an end, and expresses regret that he cannot offer help to him. He asks Ledermann if he would mind reading part of his manuscript for the forthcoming edition of <title>The Factorial Analysis of Human Ability</title>. </p><p> Also includes a postscript, referring to Ledermann's <emph>reciprocity of reference vectors and primary factors</emph>, and Thomson's puzzlement at <emph>the absence of a diagonal matrix</emph> in Ledermann's formulae, illustrated with several pages of notes and formulae.</p></scopecontent><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-115" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding <emph>the rotation of orthogonal axes, retaining their orthogonality</emph></unittitle><unitid>Coll-1064/115<extptr href="1285"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">28 Jul 1945</unitdate><physloc id="aspace_9c15ffdc9370e19411e76b8b1bc9013a">CLX-A-667</physloc><langmaterial id="aspace_88b28191959a9f308903335ed57be422">English</langmaterial></did><controlaccess><geogname authfilenumber="geog_5591" source="local">Glenapp Ayrshire Scotland</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-116" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann in which he reproduces two matrices and asks him to undertake calculations regarding them</unittitle><unitid>Coll-1064/116<extptr href="1286"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sided)</extent></physdesc><unitdate type="inclusive">20 Jan 1946</unitdate><physloc id="aspace_d28bdbc95928d595554ce5b046b72403">CLX-A-667</physloc><langmaterial id="aspace_e305e7960cc3450b82da6a412f1fc8a9">English</langmaterial></did><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-117" level="item"><did><unittitle>Un-numbered letter from Thomson regarding the possibility of Ledermann taking up a vacancy in <emph>Room 70</emph></unittitle><unitid>Coll-1064/117<extptr href="1287"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">22 Jan 1946</unitdate><physloc id="aspace_cc960d84817b213854f4b1ebe0597de2">CLX-A-667</physloc><langmaterial id="aspace_cfd249584b06e3693354a5b86dee446c">English</langmaterial></did><scopecontent id="aspace_6a9e33c36403faa13bddeb146aa210ce"><head>Scope and Contents</head><p>Thomson tells Ledermann how glad he would be if, on leaving the University of St Andrews, he would take Lawley's vacated post. He makes him aware of the disadvantages of the post, in particular that it relies on a fund and as such is not permanent, and that would be an unconventional route from which to apply for possible future mathematics lectureships. He also states Emmett's pleasure at the possibility of working with Ledermann.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-118" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding Ledermann's calculations</unittitle><unitid>Coll-1064/118<extptr href="1288"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">28 Jan 1946</unitdate><physloc id="aspace_b6d8b4478d8fa90ad8214d175af826eb">CLX-A-667</physloc><langmaterial id="aspace_98bd4d70347132ba2c52e56c1fc6ced1">English</langmaterial></did><scopecontent id="aspace_54f8237c8e7ae98e0a8fbb540950b760"><head>Scope and Contents</head><p>Thomson assures Ledermann that he understands his hesitation at accepting the post at Moray House. He also refers to calculations of Ledermann's, stating that they agree with his own, but since there are errors in Thomson's earlier calculations, will need to be checked again. He comments briefly on his disappointment at the delay in publication of the new edition of <title>The Factorial Analysis of Human Ability</title>.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-119" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann congratulating him on his new post at the University of St Andrews</unittitle><unitid>Coll-1064/119<extptr href="1289"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 1 side)</extent></physdesc><unitdate type="inclusive">1 Mar 1946</unitdate><physloc id="aspace_1e3bbe202c19360347283f00a57f3677">CLX-A-667</physloc><langmaterial id="aspace_25a31f776f173fa001474c8e85bf6821">English</langmaterial></did><scopecontent id="aspace_bff9a2c6efe01c9cb6c0a8c711b34d0e"><head>Scope and Contents</head><p>Thomson also thanks Ledermann for notes regarding proofs, and asks him if the date of his wedding is confirmed.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-120" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann regarding his seventieth birthday</unittitle><unitid>Coll-1064/120<extptr href="1290"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">27 Mar 1951</unitdate><physloc id="aspace_ce858b95684b0d3f112405627fa0cf5b">CLX-A-667</physloc><langmaterial id="aspace_885d02dfc7347dacf00b14815b5b66f7">English</langmaterial></did><scopecontent id="aspace_28198be88d8441e12a0243d77b03e7e4"><head>Scope and Contents</head><p>Thomson thanks Ledermann for his letter, most likely wishing him a happy seventieth birthday; refers to a song he used to sing to an elderly Strasburg professor; and reflects on an evening he spent with Ledermann ten years previously.</p><p> Thomson also passes on his best wishes for Ledermann's trip to Israel, and suggests times when they can meet in Manchester the following May.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-121" level="item"><did><unittitle>Un-numbered draft of a letter from Ledermann to Lady Thomson</unittitle><unitid>Coll-1064/121<extptr href="1291"/></unitid><origination label="Creator"><persname authfilenumber="pers_3264" source="local">Ledermann, Walter (Mathematician)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (4 leafs, 8 sides)</extent></physdesc><unitdate type="inclusive">Nov 1952</unitdate><physloc id="aspace_5c8490008552f9b3065315afad2129ba">CLX-A-667</physloc><langmaterial id="aspace_bb814e607f76a7d79e3ac0cef9e14538">English</langmaterial></did><scopecontent id="aspace_17f48b37e02551c780d78b6311b194b3"><head>Scope and Contents</head><p>This is an draft of a letter Ledermann sent to Lady Thomson in order to assist her in writing a biography of Thomson. Ledermann discusses how his professional relationship with Thomson commenced, the letters Thomson sent to him, and Thomson's methodology for solving mathematical problems.</p><p> The letter is written on the reverse of scrap paper with formulae and calculations.</p></scopecontent><relatedmaterial id="aspace_69e307abe8fd89a3e43fd5ee2de84421"><head>Related Materials</head><p><extref href="Coll-1310-1-1-1-17">Coll-1310/1/1/1/17</extref></p></relatedmaterial><controlaccess><persname authfilenumber="per_7905" source="local">Thomson, Jane, Lady, fl. 1890-1971</persname></controlaccess></c01><c01 id="aspace_Coll-1064-122" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann congratulating him on the birth of his child</unittitle><unitid>Coll-1064/122<extptr href="1292"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (1 leaf, 2 sides)</extent></physdesc><unitdate type="inclusive">24 May 1954</unitdate><physloc id="aspace_5f593ae9134a8648e02812da5fef878e">CLX-A-667</physloc><langmaterial id="aspace_9d656ed46d00626c7e6517532a0833e7">English</langmaterial></did><scopecontent id="aspace_6b74e4b5bb1d89c3c3890e1ea56e5c92"><head>Scope and Contents</head><p>Thomson also invites Ledermann and his family to stay with Lady Thomson and himself in Edinburgh, referring to his improved health. He also tells Ledermann that he wants his view on an article in <title>Psychometrika</title> by A Finn.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01><c01 id="aspace_Coll-1064-123" level="item"><did><unittitle>Un-numbered letter from Thomson to Ledermann referring to an article of [Y] Ahmavaara</unittitle><unitid>Coll-1064/123<extptr href="1293"/></unitid><origination label="Creator"><persname authfilenumber="per_3260" source="local">Thomson, Godfrey Hilton, Sir, 1881-1955 (psychologist and Bell Professor of Education, University of Edinburgh)</persname></origination><physdesc altrender="whole"><extent altrender="materialtype spaceoccupied">1 letter (3 leafs, 3 sides)</extent></physdesc><unitdate type="inclusive">25 May 1954</unitdate><physloc id="aspace_23101f0883bc67ac45c9d0b68cb9655e">CLX-A-667</physloc><langmaterial id="aspace_a4b6fdf249140592bcd0af473bb20d31">English</langmaterial></did><scopecontent id="aspace_7edcbc16a98ed25c3072af310b0759d1"><head>Scope and Contents</head><p>The letter most likely refers to Y Ahmavaara's 1954 article, <title>Transformation analysis of factorial data and other new analytical methods of differential psychology with their application to Thurstone's basic studies</title>, from <title>Annales Academiae Scientiarum Fennicae</title>. </p><p> In the letter, Thomson asks Ledermann to check if he is correct in his interpretation of the paper, referring to a chapter on <emph>m.v. selection</emph> in <title>The Factorial Analysis of Human Ability</title>, providing examples and working throughout.</p></scopecontent><controlaccess><geogname authfilenumber="geo_517" source="lcsh">Edinburgh (Scotland)</geogname></controlaccess></c01></dsc>
</archdesc>
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