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 148,459 pages of information and 233,880 images on early companies, their products and the people who designed and built them.

Photain Controls

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of Leatherhead.

1974 Manufactured five photoconductive cells with a peak spectral response at 7,000 angstroms, being more sensitive at the infra-red part of the spectrum.

1974 Developed a new fire alarm control system that consisted of a control unit and a separate power pack to provide two separate alarm conditions - fault warning and fire warning.[1]

See Also


Sources of Information

  1. The Engineer 1974/05/30