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 143,390 pages of information and 230,040 images on early companies, their products and the people who designed and built them.

Denny-Johnson

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Type of torsion meter for measuring the output of marine engines

1908 Described as in wide commercial use, in an article in The Engineer [1]

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