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Working notes, correspondence, annotated papers and printed pamphlets relating to telegraphy, collected by Heaviside 1872-1921. The collection comprises: Notebooks mainly consisting of mathematical equations and calculations with drafts and transcripts of papers submitted to the Philosophical Magazine and the Electrician, covering subjects such as problems with long distance signal transmission and the development of a non-distortional circuit, duplex telegraphy, the age of the earth including the development of equations for heat loss from a spherical body, measurement of resistance, eletromagnetic theory of light, the transmission of an electric charge along a wire, Maxwell's equations, vector operators for mathematical calculations; Pamphlets and publications mainly relating to telegraphy, many annotated, including works on the analysis of cathode rays, radiation, radioactivity and early attempt to define the workings of the atom, telegraphy and telephony; Papers, comprising rough notes and calculations, including drafts of papers such as Operators in Physical Mathematics Parts 2 and 3, proof copies of Electromagnetic Theory with notes and calculations on the reverse, and correspondence with The Electrician and other periodicals over the publication of his articles; Official awards and honours presented to Heaviside and other assorted items, including the award of Cedergren Medal and Gottingen University Honorary Doctorate, 1924; Notes by Heaviside on plane waves and electrification, the application of zonal harmonics on physical problems, magnetic induction, gravitational dimensions, the magnetism of the earth, on the backs of old letters; Correspondence from notable scientists and mathematicians including Sir Oliver Lodge, W E Ayrton, W H Bragg, S P Thompson, and Sir William Thomson, Baron Kelvin of Largs; Material found at Paignton, 1957, including Preliminary drafts of articles for Electromagnetic Theory; annotated galley proofs of Electromagnetic Theory; assorted papers, spare proofs of papers and miscellaneous correspondence, and additional correspondence sent to Heaviside.

Material created by Ronalds' during his time abroad, and as Honorary Director of the British Association's Observatory at Kew, with various notes on electricity, 1818-1871. It comprises material relating to Ronalds' travels abroad including journals, notebooks, sketchbooks, bills of expenses, and correspondence relating to two journeys to Italy, Egypt, the Holy Land and the Greek Islands; Material relating to 'Sketches at Carnac' and atmospheric electricity including pencil sketches and notes on atmospheric electricity taken from published sources; Correspondence while Honorary Director at the British Association's Observatory at Kew, including letters to Ronalds from various correspondents, mainly dealing with aspects of meteorology and magnetism, and the affairs of the Observatory at Kew, with technical discussion of self-registration by photography, bifilar magnets, atmospheric electricity; Notes, reports and copy correspondence relating to Ronalds' time at the Kew Observatory including a foolscap notebook with several loose insertions relating to a system devised by Ronalds for propelling or towing vessels in water by means of a stationary fulcrum; Papers relating to telescopes, fires, meteorology and Report on Kew for 1849-1850, including notes and diagrams relating to the design of a stand for a telescope, material relating to the design of a self-acting fire alarm, barometric and temperature readings, material relating to expenses and experiments at Kew for report on the observatory 1849-1850 presented to the British Association at their meeting in 1850, papers relating to a proposed 'Turner's Manual' which Ronalds began writing 1838-1839; Papers relating to perspective, the electric telegraph, galvanism and electromagnetism, electric columns, atmospheric electricity, aquatic propulsion and drawing and surveying; Notes and sketches on items relating to various subjects, including a small catalogue of books on meteorology, electricity etc, and a bundle of unused photographic paper and some tracings from Ronalds' self registering instruments; Printed material relating to Ronalds' perspective tracing instruments; Extracts from diaries and newspaper cuttings; Portrait album of well-known European scientists.