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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 on loan from Department of Physics, King's College London, including telegraph apparatus, a nail fiddle and other prototype musical instruments, [1834-1875]; exhibition of scientific and musical instruments, [1834-1875].

Papers of Professor Jean Hanson, 1938-1975, comprising undergraduate lecture notes; drafts for lectures, revised annually, for undergraduate teaching in zoology at Bedford College, 1938-1948; lectures in Biophysics given at King's College London, 1960-1973; research papers, comprising extensive laboratory notebooks and working papers, 1938-1973, which include ideas for research and comments on current and projected experiments as well as records and observations of work in progress; reports on the work of the Muscle Biophysics Unit; drafts for publications, 1950-1973; unpublished invitation lectures and talks, 1956-1973; scientific correspondence, 1956-1973, including letters exchanged with colleagues whilst at conferences or abroad, detailing research progress; 'Emmeline Jean Hanson' by Sir John Randall, reprinted from Biographical memoirs of Fellows of the Royal Society, Vol 21, Nov 1975.

Correspondence, 1887-1925, mainly between Dendy and fellow academics relating to the morphology and classification of sponges, notably with George Parker Bidder, President of the Marine Biological Association of the UK; Professor William John Dakin, Professor of Zoology, University of Liverpool; Francisco Ferrer Hernandez, Musea de Gencias Naturales, Madrid, Spain; Professor William A Haswell, Emeritus Professor of Biology, University of Sydney, Australia; Ernst Hentschel, Zoologisches Museum, Hamburg, Germany; William Abbott Herdman, University of Liverpool; Professor Sydney John Hickson, Emeritus Professor of Zoology, University of Liverpool; Randolph Kirkpartick, Natural History Museum, London; Professor James Herbert Orton, Emeritus Professor of Zoology, University of Liverpool; Joseph Pearson, Director of the Columbo Museum, Ceylon; and Edgar Thurston, Superintendent of the Government Museum, Madras, India. The correspondence also includes letters, 1919-1921, relating to the establishment of a research grant in memory of Harold Row, Dendy's assistant. Papers, 1886-1899, relating to sponge collections, particularly specimens in Australia and New Zealand, and including the dredging records for Port Phillip, Victoria, Australia, 1887-1890. Lecture notes written by Dendy, [1903-1925], including handwritten texts of lectures on 'Echinodermata', 'The development of starfish', 'Holothurioidea', 'Class Gastropoda', 'Mytilus', 'Anodarta cygnea', 'Helix', 'Mollusca', and 'Merozoa', and typescript texts of public lectures including 'The stream of life', given at a Citizens' Lecture in Edinburgh, 1921, and 'The evolution theory today', given at the Liverpool Meeting of the British Association for the Advancement of Science, 1923. Working notebooks, [1886]-1912, mainly containing scientific experiments and observations relating to sponges, notably the Challenger Amphipoda and the Grantia Compressa, and notes on the topographical distribution of, and biographical references to, sponge specimens. Two notebooks, 1917-1919, recording experiments and observations during Dendy's membership of the Royal Society's Committee for the Investigation of Grain Pests. Papers, 1892, relating to The Victorian land planarians [1894] by Dendy, comprising a volume of annotated and revised extracts from that work, and a letter to Dendy from Thomas Steel concerning flatworm species. Printed obituaries of Dendy, 1925-1926. Papers relating to the study of lizard-like reptiles commonly known as Tuatara (the scientific name being Sphenodon), [1897]-1910, including correspondence, 1908-1910, between Dendy and Edward Bles, Elliot Smith, Annie Howes and [William Thompson] Sedgwick, and catalogues, notes and photographs of Tuatara embryos.