Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,344 pages of information and 230,027 images on early companies, their products and the people who designed and built them.
Douglas Joseph Bolton M.Sc. (Eng.), London, M.I.E.E.
1939 Lecturer in Electrical Engineering, The Polytechnic, 309, Regent Street, London, W.1. Private address: 34, Compayne Gardens, Hampstead, N.W.6.