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A marine steam engine is a steam engine that is used to power a ship or boat. This article deals mainly with marine steam engines of the reciprocating type, which were in use from the inception of the steamboat in the early 19th century to their last years of large-scale manufacture during World War II. Reciprocating steam engines were progressively replaced in marine applications during the 20th century by steam turbines and marine diesel engines.

Annular

An annular engine is an unusual type of engine that has an annular (ring-shaped) cylinder.[44] Some of American pioneering engineer James P. Allaire's early compound engines were of the annular type, with a smaller, high-pressure cylinder placed in the centre of a larger, ring-shaped low-pressure cylinder.[44] Some of American pioneering engineer James P. Allaire's early compound engines were of the annular type, with a smaller, high-pressure cylinder placed in the centre of a larger, ring-shaped low-pressure cylinder.[45] Trunk engines were another type of annular engine. A third type of annular marine engine used the Siamese engine connecting mechanism—but instead of two separate cylinders, it had a single, annular-shaped cylinder wrapped around the vertical arm of the crosshead (see diagram under "Siamese" above).[46]

Other terms

Some other term

Some other terms are encountered in marine engine literature of the period. These terms, listed below, are usually used in conjunction with one or more of the basic engine classification terms listed above.

Simple

A simple eng

A simple engine is an engine that operates with single expansion of steam, regardless of the number of cylinders fitted to the engine. Up until about the mid-19th century, most ships had engines with only one cylinder, although some vessels had multiple cylinder simple engines, and/or more than one engine.

Double acting