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An engine driven by heated or by compressed air. Knight.

Flattened lengthwise. Compessed air engine, an engine operated by the elastic force of compressed air.

tance, as a heated fluid, is made to perform work by giving motion to mechanism, as a hot-air engine, or a steam engine. -- Heat producers. (Physiol.) See under Food. -- Heat rays, a term formerly applied to the rays near the red end of the spectrum, whether within or beyond the visible spectrum. -- Heat weight (Mec…

The cycle for the air engine proposed by Joule. In it air is taken by a pump from a cold chamber and compressed adiabatically until its pressure is eqal to that of the air in a hot chamber, into which it is then delivered, thereby displacing an equal amount of hot air into the engine cylinder. Here it expands adiabatic…

o drive other machines; as a water wheel, a water- pressure engine, a steam engine, a hot-air engine, etc. (c) Fig.: The original or the most effective force in any undertaking or work; as, Clarkson was the prime mover in English antislavery agitation. -- Prime number (Arith.), a number which is exactly divisible by n…

A device used in connection with hot-air engines, gas-burning furnaces, etc., in which the incoming air or gas is heated by being brought into contact with masses of iron, brick, etc., which have been previously heated by the outgoing, or escaping, hot air or gas.

ed to produce motion, as in evaporating water for a steam engine, or expanding air for an air engine. -- Solar flowers (Bot.), flowers which open and shut daily at certain hours. -- Solar lamp, an argand lamp. -- Solar microscope, a microscope consisting essentially, first, of a mirror for reflecting a beam of sunli…

A heat engine; a hot-air engine.