. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. is connected by ato foundation, and 86 MACHINERY FOR METALLIFEROUS MINES. which moves a vertical rod operating the bell crank attached to thebrakes. The engine cranks are fitted with hardwood lined strap brakes,operated by one cross shaft, applying the brakes to the discs simul-taneously. This shaft is fitted with two foot treadles, as the engineeror attendant stands at one reel or the other, and foot brake must beused in each instance. For convenience of attaching all levers t
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. is connected by ato foundation, and 86 MACHINERY FOR METALLIFEROUS MINES. which moves a vertical rod operating the bell crank attached to thebrakes. The engine cranks are fitted with hardwood lined strap brakes,operated by one cross shaft, applying the brakes to the discs simul-taneously. This shaft is fitted with two foot treadles, as the engineeror attendant stands at one reel or the other, and foot brake must beused in each instance. For convenience of attaching all levers to one substantial casting,a mounting plate is provided between the cylinders, and is bolted tothe foundation at a point where all the levers, including the stop valve. --■■■iViViTj. w^ \l^ ■^ ^ / i i i r —^ ^ - -—-^ \ Fig. 52.— Geared Hoisting Engine, Double J Reels, Flat Rope. lever, lever to link with (juadrants and standards, rocker shaft and linklevers, post brake levers with hand wheels, racks and pinions mountedon , clutch levers and foot levers for crank brakes can be reachedby the attendant without effort. An indicator is attached to each drum separately, and the pointerof each is well in view of the driver, so that he can tell the exactposition of each step or cage in the shaft. This class of engine is made in two sizes, one with double cylinders,10 in. diameter x 16 in. stroke, with drums for a 2^ in. or 3 in. x | wire rope, and designed for vertical depths of 700 or 800 ft., andthe other with double cylinders, 12 in. diameter x 16 in. stroke, for a3 in. or 3^ in. flat wire rope, for vertical lifts of 1000 ft. TERMANENT WINDING PLANTS. 87 An illustration of the use of a petroleum engine for winding purposeswill
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