Experimental notes, working papers, correspondence and lecture summaries compiled by Charles Wheatstone, 1836-1875, and photographs collected by him in that period. Notably including papers relating to the development and testing of the telegraph, [1836-1960]; descriptions of experiments and test results concerning the measurement of electromotive forces and electrical potential, [1840-1875]; experimental observations on the nature of magnetism, electricity and thermodynamics, including electromagnet design, batteries and dynamos, [1834-1855]; working papers relating to optics including experiments into refraction, colouration of compounds and polarisation, [1850-1875]; drafts of lectures on sound and musical instruments prepared by Wheatstone, [1832-1837]; material relating to the management of the Wheatstone collection of scientific instruments and library, 1890-1992; biographical material relating to the life of Wheatstone, the invention of the telegraph and Wheatstone's musical instrument manufacturing business, with unrelated newspapers, 1757-1975; stereoscopic photographs and glass negatives taken by Roger Fenton, Samuel Buckle, Jules Duboscq and others, featuring landscapes, still lifes, panoramic scenes of cities including Paris and Moscow and the interior and exterior of the Crystal Palace, Hyde Park, Sydenham, 1851, and especially the Exposition Universelle, Paris, 1855, [1850-1901]; artefacts from Department of Physics, King's College London, including demonstration equipment, telegraph apparatus, a nail fiddle and other prototype musical instruments, [1834-1875]; exhibition of scientific and musical instruments, [1834-1875].

Papers of and relating to Evelyn Underhill, 1874-1997 and undated, comprising personal correspondence of and concerning Underhill, 1888-1969 and undated, the correspondents including Baron Friedrich von Hugel (three letters, 1911-1916), Underhill's husband Hubert Stuart Moore (117 letters from Underhill to Moore, 1890-1912 and undated, and 30 letters from Moore to Underhill, 1898-1906 and undated), Rabindranath Tagore (typed transcripts of 10 letters from Underhill to Tagore, 1913-1914), and members of the Underhill family, the subjects ranging from Catholicism, travels in Italy, Switzerland and France, publications and lectures, spiritual matters and advice, mysticism, health, and World War Two; correspondence, 1907-[1954], with various publishers concerning Underhill's publications (some posthumous) and broadcasts, including copyright, costs, sales and royalties; manuscripts and typescripts containing proposed holiday itineraries and recording Underhill's impressions while travelling in Italy, Switzerland and France, 1898-1899, 1901-1907; poetry, 1917-1923 and undated, including some work which was published; a speech at King's College London on being elected a Fellow, 1927; an article on 'The Fountain of Life: an iconographical study', published in 1910; material relating to spiritual development, 1921-1939, mainly under the guidance of Baron Friedrich Von Hugel and including transcripts of his letters, 1921-1924, and other items on spiritual advice, confessions, goals and progress; papers relating to retreats and religious writings, 1924-1932 and undated, including notebooks and texts of addresses; printed material by and concerning Underhill, 1926-1941, 1990, including some of her publications; press cuttings, 1891-1949, mainly reviews of Underhill's work but also including early published pieces; sketchbooks and drawings, 1892-1911 and undated, including sketches and watercolours of marine scenes in Britain, ecclesiastical subjects, and Italian and French architecture; photographs, c1925-c1930s and undated, including a photograph and negatives of Underhill (one at Pleshey), a portrait of Baron Von Hugel, marine views, and views of French and Italian castles and towns; material relating to the Underhill family, 1874-1940, including the marriage certificate of Evelyn Underhill's parents, 1874, a family tree, c1891, a copy of Evelyn Underhill's will, 1940, and details of books in Dr Williams's Library, London, which originated from Underhill's library; obituaries of and articles about Underhill, 1941-1997, including theses, bibliographies, memoirs, biographical material and reflections on her work; newsletters of the Evelyn Underhill Association, 1992-1997.

Chelsea College Secretary's files, 1889-1998. These records reflect all aspects of the academic and administrative work of the College, ranging from strategic planning, building maintenance and finance through to University of London business where applicable to Chelsea College, notably including South-Western Polytechnic and subsequent College schemes and correspondence on the relationship of the College with the University of London, 1889-1985; governance, namely Chelsea College Senate membership, agendas, committees and other business, 1972-1985; Council minutes, agendas and membership, 1972-1987; King's, Queen's and Chelsea (KQC) Management Committee and Joint Policy Committee correspondence and papers, 1983-1985; University of London Senate agendas and minutes, 1983-1985 (Ref: 1985/CAS, 1987/CAS, 1991 CAS); papers relating to major committees such as academic planning group correspondence, 1983-1984; Finance and General Purposes Committee, Planning and Staffing Committee papers, 1983-1985, planning and resources committee papers, 1989-1991 (Ref: 1997/CAS, CAS/GC2); the general running of the College, including patents, 1972-1987; copyright, 1970-1989; College safety, 1977-1985; Data Protection Act, 1985-1987; Students' Union and student welfare, 1966-1985; a proposed merger with Westfield College, University of London, 1982-1987; the Swinnerton-Dyer Committee report documents, 1980-1982; St George's Hospital Medical School papers reflecting administrative concerns, 1976-1986; agreements and contracts with publishing companies and scientific equipment suppliers, 1968-1985; papers relating to the arsenic poisoning of porters at Chelsea College including cuttings and police investigations, 1966-1971, 1998, (Ref: CAS/AD1, 1987/CAS, 1991 CAS); personnel and staff related files including on contracts, salaries, leave entitlements, performance targets, trade unions, principally NUPE and NALGO, staff appointments and lists, 1967-1987; Academic Staff Committee minutes, papers and correspondence, 1969-1985; Technical and Manual Staff Committees, 1971-1985; demonstrators and visiting lecturers, 1975-1981 (Ref: CAS/AD8); papers relating to College property, [1970-1988] (Ref: 1987/CAS, CAS 1989); academic related papers concerning various departments at King's spanning the merger of Chelsea and King's in 1985, including Biophysics, Chemistry, English, Physiology, Spanish, Theology and War Studies, 1977-1989, Chelsea Departmental papers including the Nuffield programme, Library and Computing Department, 1966-1988 (Ref: 1987/CAS, 1991 CAS, 1992 CAS).

The records of the Department of Mathematics at King's College London include minutes, correspondence and papers, 1969-1990; notably minutes of departmental meetings, 1972-1984 (ref: 1996/KDM/F2); correspondence relating to the strategic planning of the department, arrangement of teaching, examinations and finance, 1985-1989 (ref: 1995/KDM); correspondence, mainly between Brian Davies, Professor of Mathematics, King's College London, and staff of other university departments of mathematics in the United Kingdom, the United States and Europe, concerning publications and copyright, symposia and conferences, with some material concerning personnel including sabbaticals and lecture invitations and a small quantity of material describing mathematical problems, 1969-1990 (ref: 1997/KDM); papers relating to the Chair of Mathematics, 1983-1989 (ref: 1996/KDM/F1); typescript draft of part of an edition of the works of Alan Turing, fellow of King's College Cambridge and cryptographer, 1990 (ref: 1995/KDM).