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Trip′le-cyl′in-der En′gine.

A steam-engine employing three cylinders.

In one form it has three cylinders arranged at angles of 120°, so as to act coincidently upon a threethrow crank. In the Thames River engines, one of these cylinders is an air-pump cylinder.

In Alden's (patented, May, 1875), two small cylinders alternately receive steam at each revolution, and alternately exhaust into an auxiliary large cylinder, while their pistons are balanced by the exhaust steam. See also three-cylinder engine.

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