Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,024 pages of information and 229,410 images on early companies, their products and the people who designed and built them.

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1910 Exhibited multiple rotary spark gap at the Physical Society's Exhibition[1]

See Also


Sources of Information

  1. The Times, Dec 12, 1910