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].

The papers of John Pearson comprise manuscript notebooks of lectures and experimental write-ups compiled by Pearson when he was a student at Chelsea Polytechnic, 1954-1957, and include notes on electricity, optics, electronics and circuit theory, electromagnetic theory, diffraction gratings, wave mechanics and X-ray physics.

Chelsea Polytechnic, Chelsea College of Science and Technology and Chelsea College Department of Electrical Engineering Records, 1968-1996. This series comprises correspondence with overseas research workers, 1990-1996; rough and fair copy teaching notes and handouts for students on courses taught by John Pearson and others on electronic devices, electromagnetism, circuits and control systems, microwave engineering and communications theory, 1972-1995; tape recordings of lectures on electronic devices, [1975]; Departmental research reports, 1989-1995; papers concerning a reunion of Chelsea Electronics graduates, 1985; incomplete set of examination question papers in Electronics and related disciplines, 1968-1993; group photographs of graduates, 1970-1980, 1985-1986, 1989, 1995; histories of the Electronics Department and other memorabilia, 1977-1978.

The papers of John Edmund Bowen consist of two manuscript notebooks containing notes on lectures delivered by Professor Joseph John Thomson, Cavendish Professor of Physics at Cambridge, 1911-1912. Bowen's notes consist of detailed summaries of Thomson's lectures on subjects including the discharge of electricity through gases, recombination of ions, recent developments in researches on light and electricity, scattering of electromagnetic radiation and the quantum theory of light.