. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. will be in from eight to twenty-five minutes, according to the size ofthe engine, the sixway cock is opened to admit oil and air to the vaporiser. 66 MACHINERY FOR METALLIFEROUS MINES. The flywheel is then turned, the engine draws in the explosive mixture,compresses it, and starts. The action is that the explosive mixture isdrawn in during a suction stroke, compressed in the return stroke, ignitedat the moment of full compression, and the working stroke effected bythe expansion
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. will be in from eight to twenty-five minutes, according to the size ofthe engine, the sixway cock is opened to admit oil and air to the vaporiser. 66 MACHINERY FOR METALLIFEROUS MINES. The flywheel is then turned, the engine draws in the explosive mixture,compresses it, and starts. The action is that the explosive mixture isdrawn in during a suction stroke, compressed in the return stroke, ignitedat the moment of full compression, and the working stroke effected bythe expansion. The next return stroke drives the products of combustionthrough the exhaust valve and around the jacket of the vaporisingchamber, which is thus heated. During the compression stroke a small portion of oil condensesinside the cylinder, which it thus perfectly lubricates, rendering all otherlubrication Fig. 41.âPriestmans Oil Engine coupled to a Three-Throw Pump. The ignition of the compressed oil vapour is effected by means of aspark between platinum points at k, which are connected by two insulatedwires with the battery box or igniter. A bichromate cell and inductioncoil have been found by Messrs. Priestman to be the best practical meansof providing the electricity ; and they claim that their battery will keepin work from 30 to 40 hours at a cost of under ^d.âor say, \d. per day. As to the practical results of running this engine, and the cost incomparison with steam or gas, it is stated by the manager of the TeesdaleMineral Company that an 18 horse-power oil engine supplied to his worksfor the purpose of driving a grinding mill for barytes has been , and has cost about 2d. per horse-power per hour. In that district the comparative cost of various motors is stated to beas follows : OIL ENGINES. 67 Steam Engine. 20 , working 10 hours per day. â 10 ,, 24 â
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