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The bulk of the collection consists of correspondence: the Singers were clearly vigorous letter writers and both Charles and Dorothea had an enormous number of family, friends and acquaintances. Unfortunately many of their letters were hand written and very few carbon copies survive. Very occasionally an attempt at methodical selection and arrangement is evident: on the whole correspondence had been kept in alphabetical order, and this has been retained in the arrangement of the collection. Dorothea and Charles' correspondence was fairly mixed (reflecting their working life together) with the exception of two distinct groups: correspondence about Dorothea's research on alchemical manuscripts, and later correspondence about her hearing aids.

The main part of the collection centres on the correspondence; this has been grouped together in a self-evident sequence: writings and biographical personal papers follow. Certain of Dorothea's papers remained clearly distinct and these have been kept together. Section E contains a variety of material relating to Jewish refugees, which had been placed on one side by Dorothea after the war for permanent preservation. It has not been listed in detail but sorted into three broad categories. The last section, comprising additional correspondence of the Singers with Sir Zachary Cope, Sir Arthur Salusbury MacNalty and Dr F N L Poynter, is not strictly part of the collection, but these groups of correspondence were given to the Institute to be placed alongside the Singer papers.

Louisa Martindale collection, 1872-1964. The collection consists of Section A: a little personal correspondence, papers, articles, speeches and lectures by Louisa Martindale, and some personal material including notes on the glaucoma which eventually blinded her, 1872-1960; and Section B: papers concerning the Medical Women's International Association (founded 1919) of which Miss Martindale was President from 1937 to 1947. As well as her own correspondence in this capacity, 1937-1946, there is one file of the correspondence of Mme Montreuil-Strauss, Secretary of the Medical Women's International Association at his period. (Louisa Martindale destroyed the vast bulk of her case records at the time of her retirement from practice around 1950, those remaining were destroyed by her executors after her death).

General Optical Council administrative records, 1959-2000: minutes of the meetings of the Council and its various committees including related memos and correspondence, Annual Reports of the Council and Committees, Notices of Motion, Registers of Opticians and Lists of Corporate Bodies.

Journal kept by John Gallop during the building of the MRC Cyclotron Unit, Hammersmith, 1949-1956, plus reports, correspondence and photographs, regarding the MRC cyclotron and many in American institutions. The 'MRC Policy' files contain reports and correspondence generated during the planning and execution of the cyclotron project, and give a good picture of the background negotiations as well as the day-to-day administration. Gallop's tutorial to the Stafford Hospital Postgraduate Medical School (G.1) summarises his view of the process. Both Gallop and J W Boag sent detailed reports of the cyclotrons which they visited in the USA in 1949-1950 (C.1-6), which Gallop prepared for publication (C.7) and lectures (C.8). The correspondence in Sections D and E contains further reports, and the personal correspondence (Section F), especially the letters from Boag, includes further thoughts on cyclotron development and use.