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Ch. 11: Pipes and Nozzles

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PIPES AND NOZZLES.
181
the strain on the bolt and reduced the friction on the joint proper." These machines were hard to manage and soon became leaky at the joint.
Hydraulic Chief.—The invention of Mr. Craig was succeeded by the " Hydraulic Chief," sometimes known as the " Knuckle-joint and Nozzle," invented by Mr. F. H. Fisher. The main features consist of two elbows placed
in reversed position when in right line, connected by a ring in which there are anti-friction rolls. The ring is bolted to a flange on the elbow, but gives the upper elbow a free horizontal movement, while the vertical mo­tion is obtained through the knuckle-joint, which is placed
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