. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 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 extr
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. 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. Ithas been running under these conditions for over three years, and theonly repairs needed have been the replacing of a few buckets. The dimensions of a 6-ft. standard wheel will be found in fig. 13 ;. m—^~—^h^ itlii I- 3 9 t-13-l 3 »■ Fig. 14.—6-FT. Double Nozzle Pelton Waterwheel. and wheels are made in all sizes downwards, from this to a 4-in. wheel,which can be used for driving a sewing machine or other light work. The power of a Pelton wheel does not depend upon its diameter, butupon the head and amount of water applied to it. Where a veryconsiderable power is wanted under a comparatively low head, a largerwheel is necessary, in order to admit of buckets of sufficient size to copewith a larger stream of water. Wheels of greater dimensions are alsodesirable in many cases with reference to reducing the speed, when thesmaller will furnish all the power needed. The velocity of the wheel being determined by the head, the diameter canthen be made to conform to the speed required, and the buckets and nozzledelivery proportioned to the amount of water available
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