Salmson aero engine, c 1911-1918.
© Science Museum / Science & Society Picture Library
Photograph of two men posing alongside one of the Salmson aero engines that were made to licence by Dudbridge Iron Works Limited in Stroud, Gloucestershire, to the designs of the Paris-based French aero company, Salmson, between 1911 and 1918. The right-hand figure is believed to be Arnold Levien, an aero engineer from Salmson, Paris. Dudbridge specialised in the manufacture of gas engines but increased aero engine production during World War I.