Each line of
pumps is driven from a crank placed on a steel spur-wheel shaft 15 inches
in diameter, making ten revolutions per minute. The mortise spur-wheels
have a diameter of 221/2 feet at the pitch line, with two rows of teeth,
each 15 inches face. The pitch is 4.72 inches. Engaging with the mortise
wheels are pinions of gun iron 4 feet 6 inches in diameter, placed on
steel shafts 12 inches in diameter, and making 50 revolutions per minute.
The 12 inch pinion shafts are driven through mortise wheels 12 feet in
diameter, and 24 inches face, by pinions 3 feet 9 inches diameter, which
make 160 revolutions a minute. The pinion shafts are driven through a
wire rope transmission from an engine located 500 feet distant. The rope
wheels are 15 feet in diameter, and make 160 revolutions a minute. The
engine is 4,700 horse power, and, in addition to driving the pumping
machinery, does the hoisting and air compressing for the Calumet mine.
In the same building with the mine pump gearing is a duplicate
arrangement for operating the man engine. In order to operate the mine
pumps and man engine for the Hecla mine, it was necessary to use rock
shafts, which are made of gun iron, and hollow; they are 32 inches in
diameter outside, with 41/2 inches thickness of metal.
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