218
MODERN STEAM PRACTICE.
the water to a high-level reservoir, placed at a level of about 200 feetabove ordinance. The springs, of which there are several, are esti-mated to yield 230,000 gallons in the twenty-four hours, and theengine working ten hours per day is calculated to raise 61 cubic feetper minute. The height being 178 feet, and the length of track8145 feet, with a diameter'for the rising main of 9 inches, the head
q 27
allowed for friction was 24 feet, found by the formula
22 d a
which makes a total height of 202 feet. To calculate the horse-power required to raise the water to the high reservoir: By the
ordinary method 61 ^ 62 ^ we have a result of 24, and adding
a fourth more for loss = 30 horse-power for the engine. It is worthyof remark that the pressure gauge on the air vessel registers anincrease of 10 lbs., which is equivalent to 24 feet of head while
working, and when standing the pressure is reduced to that due tothe statical pressure, namely, 178 feet.
The engine, which is non-condensing, and is placed vertically, is