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Water Elevator.

Description: Patent for a new and improved water-elevator. This design "has for its object to provide for the escape of the air initially held in the upper bends of the screw, so as to relieve the same of the pneumatic pressure caused thereby in connection with the ascending water, thus causing less resistance to the rotation of the screw, enabling it to be operated by decreased motive power" (lines 11-18).
Date: November 9, 1886
Creator: Campbell, George W.
Partner: UNT Libraries Government Documents Department