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PIPES AND NOZZLES.
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181
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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.
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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
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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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