Work on Photo-Electric and Proximity Fuzes. The material is presented as follows: Reports, correspondence and wotking papers. August 1937-August 1940 Committee of Imperial Defence. Sub-Committee on Air Defence Research, Fuze Sub-Committee. Committee papers and reports. October 1937-May 1939 Ministry of Supply. Advisory Council on Scientific Research and Technical Development. Fuze Committee and Proximity Fuze Sub-Committee. 1937-1942