. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 13.—6-ft. Standard Pelton Waterwheel. while in passing out it sweeps against the curved sides with a reactionaryinfluence, giving it the effect of a prolonged impact. It is also bythis means deflected from the course of the wheel, so as to offer noresistance to its motion. That the power of the water is fully ex-hausted would appear from the fact that it falls from the buckets DOUBLE NOZZLE PELTON WHEEL. 15 practically inert, no water being carried over; nothing but a mist
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Fig. 13.—6-ft. Standard Pelton Waterwheel. while in passing out it sweeps against the curved sides with a reactionaryinfluence, giving it the effect of a prolonged impact. It is also bythis means deflected from the course of the wheel, so as to offer noresistance to its motion. That the power of the water is fully ex-hausted would appear from the fact that it falls from the buckets DOUBLE NOZZLE PELTON WHEEL. 15 practically inert, no water being carried over; nothing but a mistabove and a stream below to indicate the force which has been liberated. The Pelton is essentially a high-pressure wheel, and is not recom-mended for heads of less than 100 ft. As regards the extreme pressure consequent upon high heads,there is no practical limit to the head under which it can be operated ;as, for instance, at the collar shaft of the Comstock, where a Peltonis at work under a head of 1680 ft., equal to a pressure of 722 square inch, and realises an average efficiency of 88 per cent. Ith
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