- an engine that uses the expansion of heated air to drive a piston
- a small engine that uses compressed air to drive a piston
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Historical Examples of air engine
Myself, I do not think He keeps the world waitin' for this air-engine.
Air-engine, an engine in which air heated, and so expanded, or compressed air is used as the motive power.
An air-engine works through the expansion of air in a cylinder by heat.Steam Steel and Electricity
James W. Steele