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A eight cylinder Bentley superheated steam engine fitted to a tractor. The steam is used to move the piston.

Bentley Eight Cylinder Diagonal Tandem Compound Superheated Steam Engine for Tractor

A eight cylinder Bentley superheated steam engine fitted to a tractor. The steam is used to move the…

"In this engine the cam—shaft by which the steam and exhaust valves are operated is situated midway of the shaft." —Encyclopaedia Britannica, 1910

Sheppee Motor Company Compact Double Acting SUperheated Engine

"In this engine the cam—shaft by which the steam and exhaust valves are operated is situated midway…