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 143,029 pages of information and 229,411 images on early companies, their products and the people who designed and built them.

Hewitt Engines

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November 1909.

Internal combustion engine with piston valves, designed by J. M. Hewitt and made under licence by Davy Engineering

1909 May. Patent No. 5406 dated 5th March 1909 for carburettors, to W. J. Pearman and Hewitt Engines Ltd [1]

1909 November. Details of the Hewitt Piston Valve Engine.[2]

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