Ca. 1825 American Hydraulic Company "Coffee Grinder"  Rotary Pumper.   John Cooper of Guilford, Vermont built dozens of these rotary vane pump engines between 1825 and 1835.  They were used in New England and the Middle Atlantic States.  Cranked by 8 to 10 men, the pump could supply a large volume of water at low pressure.  At high pressures (using a nozzle with a small orifice) the cranks became very difficult to turn  This shortcoming reduced the demand for rotaries, despite their simplicity.  This engine was probably used by a volunteer company in New York or Pennsylvania.

Owned by Hall of Flames and on display at their museum in Phoenix, Arizona.