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steeple compound engine
A steeple compound engine is a form of tandem compound steam engine that is constructed as an inverted vertical engine. Because of their great height, they became known as "steeple" engines.
== Compound engines ==
Compound engines have either two or three cylinders, in which the steam is expanded in turn. The exhaust of the high-pressure or HP cylinder feeds the low-pressure or LP cylinder. Three cylinder engines also had an intermediate-pressure or IP cylinder, but these were less common than two cylinder engines.〕 For marine engines, their better efficiency amounted to reduced fuel consumption, thus greater range or cargo capacity. For other uses, the increased capital cost of a triple-expansion engine was not so commonly worthwhile.|group=note}}. In the tandem compound, both cylinders are mounted on the same piston rod and move together. Each cylinder has independent valves and valve gear. The pipe connecting them may be enlarged to form a 'receiver', a reservoir for steam at the intermediate pressure. This improves the efficiency of compound engines.
Other than their great height, the tandem compound steeple engine had no connection to Napier's earlier steeple engine, as used for paddle steamers on the Clyde. The vertical tandem compound has been used for marine use in small steamboats, although not under the 'steeple' name. Horizontal space in such boats is often more restricted than vertical height.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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