and a half miles from the mine. There are located here 3 pumping engines;
two of which have a capacity of 20,000,000 gallons a day, and a third
10,000,000 gallons a day. The water is elevated between 50 and 60 feet,
and is used for treating the stamped rock. Two of the engines are of the
inverted compound beam and fly-wheel type; and the third is a geared
pump, which has a horizontal double acting plunger, 36 inches in
diameter, by six foot stroke, driven from the crank of a spur-wheel
shaft.

The spur wheel is 12 feet diameter, 24 inches face, and contains 96
teeth. The pinion engaging with it has 27 teeth, and is fast on the
fly-wheel shaft of a Brown horizontal engine, having a cylinder 18 inches
in diameter, and a stroke of four feet. The steam pressure used is 110
pounds per square inch; and the engine has a Buckley condenser. The pump
valves are annular, of brass, faced with rubber, and close by brass
spiral spiral springs. Their external diameter is six inches, and the
lift is confined to ½ inch. There are 91 suction and 91 delivery valves
at each end of the pump. The maximum speed of this pump is twenty-six
double strokes a minute.

The largest of the compound engines is named Ontario, and has a vertical
low pressure cylinder 36 inches in diameter, and an inclined high
pressure cylinder 17½ inches in diameter; the stroke of both being five
feet. These are inverted over a beam, or rocker; and the pistons are
connected to opposite ends of the same.

The beam attachment of the main connecting rod is made to a pin located
above and midway between the pins for piston connections.

The main center of the beam and the crank shaft have their pedestals in