. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. handles, are all brought to the back, so as to be readily handled byone man. The illustrations are from drawings to scale, and showclearly the details of the whole arrangement. Engines of this type require solid foundations of masonry, and astheir use would imply that the mineral wealth of the undertaking was fullyestablished, they should be covered in with a substantial engine house. Geared Hoisting Engine, American Type.—The hoistingengine shown (on a small scale) in connecti
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. handles, are all brought to the back, so as to be readily handled byone man. The illustrations are from drawings to scale, and showclearly the details of the whole arrangement. Engines of this type require solid foundations of masonry, and astheir use would imply that the mineral wealth of the undertaking was fullyestablished, they should be covered in with a substantial engine house. Geared Hoisting Engine, American Type.—The hoistingengine shown (on a small scale) in connection with the pit-head framefor an inclined shaft in fig. 58 (p. 92), may be taken as typical ofthis class of machine as made in America. In the illustration the twoflat rope drums are shown in use ; for round ropes the engine would ofnecessity be wider, but the general arrangements would remain the same. An enlarged view of these engines is given in fig. 52, which is theside elevation, and fig. 53 the plan. 84 MACIIINKRV KOU METALLIFEROUS MINES. There are two slide-valve engines, with link motion reversing gear. attached, nearly at right angles to the same crank shaft, on which PERMANENT WINDING TLANTS. is a large pinion wheel, which gears into the spur-centre of the drum shaft. The crank shaft is supportedin the centre by means of a bearingon each side of the pinion, inaddition to those on the engineframe. The drum shaft bearingboxes are made in halves, linedwith composition metal, and fittedinto planed seats in the cast ironextension pieces of the engineframe, and are secured bysubstantial caps bolted to theframe. The drums are independent,run loose on the shaft, and areprovided with composition metalbushings, held in place by bolts,admitting of their being readilyreplaced when worn. The hubsof the drums have a four-toe clutchcast on, and are fitted with sub-stantial clutches, which are soconstructed that they can bequickly thrown in under are operated by two h
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