Dated 1926-1992. From Material relating to the bequest to King's College London by Charles Wheatstone of his papers, books and scientific instruments, 1890-1992.

Series of Christie's and Sotheby's sale catalogues, inventories and correspondence relating to the disposal of electrical and other apparatus from the Wheatstone collection, with photographs, 1987-1992; the safe storage of artefacts during World War Two, 1939; relating to the design of a replica of Charles Babbage's difference engine, 1958-1971; loan and transfer of items to institutions including the Science Museum, South Kensington, the Queen's University of Belfast, the Smithsonian Institution, Washington DC, US.