[Illustration: FIG. 15.]
This method of transmitting power appears to work most perfectly and has
given excellent satisfaction. It is thought, at the Idaho, to be greatly
preferable to the gearing formerly in use when the works were driven by
steam (for such work as pumping or hoisting, leather or rubber belting is
never used), besides being much cheaper in first cost.
The wheel driving the air-compressor is 6 feet in diameter, running 300
turns[5] per minute, with 1-15/18-inch nozzle; three ropes are used from
the wheel shaft to the counter-shaft, and six ropes from the latter to the
fly-wheel shaft.
[Footnote 5: The revolutions per minute, of these wheels, as here given,
are only approximate, as the design was to have the bucket speed=1/2
2(gh)^{1/2}.]
For driving the pumps, there are two water-wheels, set on the same shaft,
one 5 feet and the other 7 feet in diameter, either of which can be used
at will, thus permitting different rates of speed; two nozzles are placed
on each wheel, so that if necessary the power can at any time be doubled.
The smaller wheel has a 1-1/4 inch nozzle, and runs 360 turns a minute;
the larger has 1-1/8-inch nozzle, and makes 270 turns a minute. There are
two ropes from the wheel-shaft to a counter-shaft, and four ropes to the
fly-wheel shaft, on which is the pinion driving the spur-wheel attached to
the pitman of the pump-bob.
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