. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. siderable economy thus effected. An example of the use of petroleum engines may be found atthe Clogau Mine of the St. Davids Gold and Copper Co., Limited, inMerionethshire, North Wales, where a small petroleum engine is in usedriving an air compressor, and another one inside the mine for windingand pumping. The disadvantage of this latter is the smell created, which,before special ventilation pipes were inserted, was insupportable. The 50-stamp mill at the same mine is driven b
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. siderable economy thus effected. An example of the use of petroleum engines may be found atthe Clogau Mine of the St. Davids Gold and Copper Co., Limited, inMerionethshire, North Wales, where a small petroleum engine is in usedriving an air compressor, and another one inside the mine for windingand pumping. The disadvantage of this latter is the smell created, which,before special ventilation pipes were inserted, was insupportable. The 50-stamp mill at the same mine is driven by a Pelton wheel whenthere is sufficient water. In addition to this, and in reserve for dry seasons,a 150 horse-power Crossley gas engine has been erected, the gas being 68 MACHINERY FOR METALLIFEROUS MINES. made on the spot from a producer. The fuel consumption is one poundof Welsh anthracite coal per horse-power per hour. The Union Hoisting Engine.—Gas engines for mining purposesare much in use in the United States. In fig. 42 will be seen anillustration of a Union hoisting engine, which consists of a double. Fig. 42.—The Union Hoist. cylinder vertical engine and hoist combined. The engine runs on gasoline,naphtha, or benzine, and if ordinary gas is handy can be adapted for thatalso. The engine in the illustration is 10 horse-power, and will lift oneton 125 ft. per minute from a maximum depth of 500 ft. These enginesare made in sizes from 4 horse-power to 50 horse-power, by the Union(las Engine Company, of San Francisco. A difficulty in the use of gas or petroleum engines arises from thefact that the engine must be kept constantly running and cannot be GAS PRODUCERS. 69 stopped and started at will like a steam engine. For use therefore forintermittent purposes, clutch or friction gearing are necessary, and manysatisfactory devices have been designed for this purpose by both homeand foreign manufacturers. At the Cwmystwith Mines, in North Wales,there is a gas plant in rese
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