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tractione engine montage
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Enfield Pageant of Motoring (Steam Section) 1993

1921 Wallis and Steevens 7nhp Expansion Engine - Eileen the Erring
Works No. 7683 -  Reg. No. BL 795
An example of the manufacturers expansion engine, that's designed to gain greater efficiency while threshing by reducing the steam admission to the cylinder. This engine spent most of its working life in Hampshire and still carries the plaque of the Hampshire War Agricultural Committee.

1921 Wallis and Steevens 7nhp Expansion Engine - Eileen the Erring