Model, of a power sucking pump.

Model of a sucking pump made by Jeremiah Sisson, 1756. This pump was used to lift water from a trough at the base to the spout at the top of the cylinder. The rotary motion of the handle was translated into the vertical stroke of the piston. Dr. Stephen Demainbray (1710-1782), a lecturer in experimental philosophy, exhibited the pump for Jeremiah Sisson in 1756. The late Prince of Wales mentioned in the inscription was Frederick, George III's father, who died in 1751.