GARY BROWN / SCIENCE PHOTO LIBRARY GARY BROWN / SCIENCE PHOTO LIBRARY
Robert Stirling (1790-1878). Caricature of the Scottish clergyman and inventor Reverend Dr Robert Stirling. Stirling is best known for inventing the Stirling engine, a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, in a way that produces a net conversion of heat energy to mechanical work.
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