Model of an Oscillating Pump, anonymous, 1821 Canvas Print
Model of a pendulum pump, on a tripod. It is a double-acting pump with two square pump tubes, which are connected downstairs with a single, round pump tube. The pump pistons consist of a metal plate that is placed diagonally in the pump tube and on which two triangular, leather-lined valves; they are weighted down with lead. At the bottom of the square pump tubes, pump buckets of the same design are placed. The pistons are connected to each other by a chain that runs over a wheel in the pump box; on the outside, a pendulum is attached to the axis of the wheel, and above a yoke for a chain or rope; with this yoke, the pendulum movement is started, so that the pistons are each in turn pulled up and descend.
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