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].

World War Two maps of the United Kingdom, France, the Netherlands, Germany, and Italy, produced by the Geographical Section, General Staff and the Army Map Service, US Army, including one inch to the one mile ordnance survey maps of England and Wales produced by the Geographical Section, General Staff, including of London, Bath and Bristol, Cardiff and the mouth of the Severn, Windsor, the Isle of Wight, Weymouth and Dorchester, Bolton and Manchester, 1940-1942; one inch to the one mile ordnance survey maps of British counties produced by the Geographical Section, General Staff, 1940-1942; 1:250,000 and 1:500,000 scale maps of Germany produced by the Geographical Section, General Staff, including of Kiel, Hamburg, Halle, Leipzig, Lubeck, Bremen, Frankfurt-am-Main, Hannover, Osnabrück, Magdeburg, Schwerin, and Munich; Army Map Service, US Army 1:200,000 road maps of France copied from 1939 Michelin guide including of the Carcassonne-Nimes, Avignon-Digne, Auxerre-Dijon, Mons- Luxembourg, and Lyon-Geneve areas, 1943-1944; 1:100,000 map of Utrecht, Netherlands, 1:50,000 map of Arnhem, Netherlands, and 1:250,000 map of Amsterdam, Netherlands, produced by the Geographical Section, General Staff, 1940-1944; 1:250,000 maps of Italy produced by the Geographical Section, General Staff, including of Bologna, Firenze, Genova, and Siena, 1943