Chapin Mine Cornish Pumping Engine
(Double Expansion Tandem Steam Engine)
Iron Mountain, MI
6/6/2013

Engine Specifications:

Double Expansion Tandem Steam Engine
Cylinders (HP/LP): 50/100
Stroke: 10'
In service 1890-1932

ASME Historical Landmark Document

(More details)

The pump actually operated a "beam" which raised & lowered a rod that extended 1500' down the vertical mine shaft.  Eight separate pumps operated off the up & down motion of the rod pumping water 170-190' per stage.