Hoisting is done by two wheels placed side by
side on the same shaft, the buckets and nozzle of each wheel being placed
in opposite directions. Both wheels are 8 feet in diameter, with
15/16-inch nozzles, and make at full speed about 225 turns a minute.
Reversing the movement of the shaft is done by shutting off water from one
wheel, and turning water on the other wheel; the two water-gates for these
nozzles are quickly opened or closed by hydrostatic pressure, afforded
from the water main. In addition to the usual brakes on the winding-reels,
a brake is placed on the wheel-shaft, so that it can be stopped in a very
short period of time.
The shock to the pipe by the almost instantaneous cutting off the water at
these hoisting-wheels (nearly one cubic foot per second) has not
apparently had any injurious, effect. To lessen this shock, a compensating
balance was designed, but which is not now in use. A wheel, of small
diameter, is used for the smithy, etc., running at a very high velocity.
The wheel driving the stamp-mill is 6 feet in diameter, makes 300
revolutions a minute, and is supplied through a 1-3/16 inch nozzle. The
head of water at this point is a few feet greater than at the other
wheels. Power is transmitted from the hoisting and mill-wheel shafts by
two and four ropes, the same as with the pumping rig.
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