Excerpt from Steam and the Marine Steam-Engine

Condensing. - The steam, when its work is done, is allowed to escape from the cylinder, but not usually to the atmosphere, it passes generally to an exhausted condensing vessel, where it is immediately condensed to water, and the resistance the exhaust steam would otherwise offer to the piston's motion is thus largely removed. In certain cases, as in locomotive engines, the con denser is omitted for Special reasons. The great majority of stationary land engines, however, and all marine engines, are condensing engines.

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