Mackenzie-Lewis polygraph, in case, by Cambridge and Paul Instrument Co., London, c.1920 Mackenzie-Lewis polygraph 1919-1930
Microscope lathe attachment for use in precision screw-cutting made by Cambridge Instruments. Microscope lathe attachment
Einthoven string galvanometer by the Cambridge & Paul Instrument Co. Ltd., England, comprising electromagnet assembly (not numbered) fitted with microprojector assembly no. C 30711 made in 1923, and string assembly no. C 50532 made in 1924 in separate fitted wooden box. (Fixing screws for microprojector assembly missing and minor damage to some other screws). Einthoven string galvanometer by the Cambridge & Paul Instrument Co. Ltd. 1923-1924
Moving plate slide for use with an Einthoven string galvanometer, by the Cambridge & Paul Instrument Co. Ltd., London & Cambridge, no. C 37193, made in 1923. (Cover missing). Moving plate slide for use with an Einthoven string galvanometer 1923
Thread recorder by the Cambridge & Paul Instrument Co Ltd., London & Cambridge, C20350. Thread recorder by the Cambridge & Paul Instrument Co Ltd.