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Ch. 11: Pipes and Nozzles

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PIPES AND NOZZLES.
ing to 22 inches and 15 inches for the branches. At this mine nozzles of 6 inches to 9 inches diameter are used under a head of 450 feet. At the American Mine the pipes are 34, 22, and 15 inches. At the Bonanza Mine all the pipes are 16 inches. At the Milton Company's Manzanita Mine the pipe is 22 inches from the pressure box to the nozzles. This pipe is 4,000 feet long, with a head of 430 feet.
THE DISCHARGE PIPE OR NOZZLE.
Goose Neck.—The first improvement in discharge pipes was a flexible iron joint formed by two elbows, one working over the other, with a coupling joint between them. These elbows were called Goose Necks.
Their construction was very defective. The pressure of the water caused the joint to move hard, and when the pipe was turned horizontally it was apt to " buck," or fly around in a contrary direction. The same thing occurred in elevating and depressing the pipe.
Globe Monitor.—The Goose Neck was succeeded by the Craig Globe Monitor, a simple ball-and-socket joint, which was difficult to work, often requiring several men to manipulate it.
A subsequent invention of Mr. Craig was the interior tripod and belt. " This was a tripod with a centre hav­ing a hole to take a bolt with a knob on the end ; the other end passed out through the top of the elbow and had a nut with a lever. By tightening the nut it threw
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