Power sucking pump, 1756.

Model of a pump made by Jeremiah Sison. 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 science lecturer, exhibited the pump for Jeremiah Sison in 1756. The late Prince of Wales mentioned in the inscription was Frederick, George III's father, who died in 1751.