Chain″ pump′ (?). A pump consisting of an endless chain, running over a drum or wheel by which it is moved, and dipping below the water to be raised. The chain has at intervals disks or lifts which fit the tube through which the ascending part passes and carry the water to the point of discharge.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.