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Hy-drau′lic Mo′tor.

A water-engine.

1. A hydraulic ram having connections which raise a piston that is forced down by atmospheric pressure at each cessation of the downward flow of water. By suitably arranged valves the water may be admitted alternately above and below the piston, causing a reciprocating action similar to that of the steam-engine.

2. A machine in which a piston is moved in a cylinder by water from a head or stand pipe, in the manner of a steam-engine. Some engines on the Continent of Europe work with a head of 200 feet conducted by a pipe. See hydraulic engine.

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