A hot air engine (historically called an air engine or caloric engine) is any heat engine that uses the expansion and contraction of air under the influence of a temperature change to convert thermal energy into mechanical work. These engines may be based on a number of thermodynamic cycles encompassing both open cycle devices such as those of Sir...
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http://en.wikipedia.org/wiki/Hot_air_engine
(from the article `technology, history of`) ...of these machines stimulated speculation about alternative sources of power, and in at least one case achieved a success the full consequences of ...
Found on
http://www.britannica.com/eb/a-z/h/72
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