A method of working a reciprocating pump by rotary motion. A rope, carrying the pump-rod, is attached to the wheel, A, which runs loosely upon the shaft. The
shaft carries a cam, C, and has a continuous
rotary motion. At every revolution the cam
seizes the hooked catch, B, attached to the
wheel, and drags it round, together with the
wheel, and raises the rope until, on the extremity
of the catch striking the stationary
stop above, the catch is released, and the
wheel is returned by the weight of the pump bucket.