. Report of the Geological exploration of the fortieth parallel . Curry mine. In the case illustrated the bob ismade entirely of wrought-iron. Its method of operation is shown in thedrawing on Plate XVI. The pumping engine drives, by means of the pin-ion, the pump wheel, to one side of which is attached, by means of a wrist-pin, one end of the pitman. As the wheel is set in revolution by the engine,the pitman receives a reciprocating motion, the length of stroke beingdetermined by the distance of the wrist-pin from the center of the other end of the pitman being connected to the king
. Report of the Geological exploration of the fortieth parallel . Curry mine. In the case illustrated the bob ismade entirely of wrought-iron. Its method of operation is shown in thedrawing on Plate XVI. The pumping engine drives, by means of the pin-ion, the pump wheel, to one side of which is attached, by means of a wrist-pin, one end of the pitman. As the wheel is set in revolution by the engine,the pitman receives a reciprocating motion, the length of stroke beingdetermined by the distance of the wrist-pin from the center of the other end of the pitman being connected to the king-post of the bob,causes that to oscillate, giving to the pump-rod in the shaft an upward anddownward motion. The upper section of the rod is usually connected tothe nose of the bob and the next lower section of the rod by means of astrap and boxes, so as to allow for the vibration caused by the angular motionof the bob; deeper in the shaft the sections are joined together as alreadyshown, forming one continuous piece, which is guided in its movement by Piale X. Scale: 6*. THE COMSTOCK MIXES. 129 timbers, t, t, Fig. 5, Plate IX, fixed across the shaft at right angles so as toconfine the rod on four sides and prevent vibration. The timbers, t, t, Fig. 5, which are placed in the shaft at frequent inter-vals, also serve to prevent the rod from falling far, in case of fracture, byfurnishing support to the catching pieces, d, d, which are attached to the rodfor this purpose. These catching pieces are attached by iron clamps or straps,which are sometimes applied as shown in Fig. 5, where each clamp embracesthe main rod and only one side-piece; or sometimes, as shown in the attach-ment of the plunger to the main Iod in Fig. 1, where each clamp embracesthe rod and both side-pieces. The arrangement in Fig. 5 is preferred bysome, as each side-piece is thus attached independently of the other. The length of stroke, or upward and downward movement of the rod,varies from 3 or 4 to 7 or 8 fee
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