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].

Records, c1869-1979, of the Strand School and its predecessors, comprising Headmaster's general and policy files, 1875-1977 (Ref: KSS/GPF); minutes of the Strand School, 1913-1938, and minutes relating to staff, 1957-1978, Houses of the school, 1942-1969, school societies, 1936-1957, parents' open evenings, 1956-1969, and conference of Headmasters and mistresses of London County Council (LCC) secondary schools, 1925-1952 (Ref: KSS/M); ledgers of pupils' accounts with the school, 1868-1908 (Ref: KSS/L); printed school accounts, 1910-1913 (Ref: KSS/ACC); registers containing staff details, 1893-1970, pupils' details, 1900-1925, 1931-1936, 1946-1979, and House records, 1933-1959 (Ref: KSS/R); Headmaster's albums of commended essays and artwork, 1912-1929 (Ref: KSS/ALB); record books of the Nature Society, 1909-1939, and sports record book, 1950-1956 (Ref: KSS/RB); programmes for school events, 1905-1912, 1950-1973, and school calendars, 1969-1977 (Ref: KSS/PRG); school magazines, 1905-1977 (Ref: KSS/PM); school prospectuses, 1915, 1938 (Ref: KSS/SYL); catalogues of books in Strand School and King's College use, c1869-c1894 (Ref: KSS/CA); bound addresses of thanks from staff and students to William Braginton, 1909-1910 (Ref: KSS/SP); private papers of Lt H Alnwick, comprising exercise books of plays written by him, 1924 (Ref: KSS/PP); ephemera including various invitation cards to school events, 1912, 1957-1968, a scheme for amalgamation of schools, 1906, regulations regarding management of the school, 1909, and the Strand School song and school rules, both undated (Ref: KSS/EPH); photographs, c1900-c1970 and undated, including school classes, staff, sports, portrait of William Braginton and the front of the Strand School, Brixton (Ref: KSS/PH); LCC's London School Plan and associated maps, 1947 (Ref: KSS/PBN); Keith Thomas White, 'History of Strand School, 1875-1913', written for MA in Science Education, Chelsea College, University of London, 1984 (Ref: KSS/TH).

Records, 1868-1911, of King's College School, including annual lists of pupils and amounts paid for books, 1868-1896, and indexes of books in use [late 19th century] (Ref: KS/LI); papers on the removal of the School to Wimbledon, 1897; cash accounts for Trustees meetings, 1897-1900; correspondence on raising funds for the School, 1902-1903; correspondence on the financial consequences of severance of the School from King's College London, 1905-1906; applications for the headmastership, 1906; correspondence on a proposal for a pupils' boarding house in Wimbledon, 1909-1910; correspondence and papers on School affairs including transfer of the School from King's College London, financial affairs, the new governing body, and applications for the headmastership, 1909-1911 (Ref: KS/F).