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compound engine

British  

noun

  1. a steam engine in which the steam is expanded in more than one stage, first in a high-pressure cylinder and then in one or more low-pressure cylinders

  2. a reciprocating engine in which the exhaust gases are expanded in a turbine to drive a turbocharger

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Although the Wright turbo compound engine was standard on both the DC-7 and Super Constellation, it proved so unsatisfactory that airlines were not interested in Wright engines for the new jet airliners.

From Time Magazine Archive

Q. How should a compound engine be lubricated?

From The Traveling Engineers' Association To Improve The Locomotive Engine Service of American Railroads by Anonymous

In a compound engine the steam first enters the small or high pressure cylinder and is then exhausted into the large or low pressure cylinder, where the expansive force is all obtained.

From Rough and Tumble Engineering by James H. Maggard

The compound engine, even, as has been seen, was invented by contemporaries of Watt, and the only important modifications since his time have occurred in details.

From A History of the Growth of the Steam-Engine by Robert H. Thurston

Q. In case it was necessary to disconnect on one side of a compound engine, how would you cover ports and hold valves in position?

From The Traveling Engineers' Association To Improve The Locomotive Engine Service of American Railroads by Anonymous

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