. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. y at least 2 ft. of water, as shown in the plate, bybeing immersed in a sort of brickwork well formed at the commencementof the tail-race. A safety-valve should be fixed at the lower end ofthe pressure pipes in order to prevent their being damaged by the suddencutting off of the water causing hydraulic blows, which may burst the THE PELTON WHEEL. 13 pipe line. A small air-pipe must be carried from the top of the supplypipe to a point at a higher level than the surface of the he
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. y at least 2 ft. of water, as shown in the plate, bybeing immersed in a sort of brickwork well formed at the commencementof the tail-race. A safety-valve should be fixed at the lower end ofthe pressure pipes in order to prevent their being damaged by the suddencutting off of the water causing hydraulic blows, which may burst the THE PELTON WHEEL. 13 pipe line. A small air-pipe must be carried from the top of the supplypipe to a point at a higher level than the surface of the will secure the pipes running empty when the water is turned off atthe top, and will prevent the strainer from being pulled down by suction,should it be so covered with leaves as to stop the inflowing water. The speed of the water running in the head and tail races shouldnot exceed from 2 to 2| ft. per record, in order to avoid loss of dimensions of the races must be arranged to take the properquantity of water at the above speed. The Pelton Waterwheel.—This wheel is what may be termed a. Fig. 12.—The Pelton Waterwheel. tangential reaction wheel, the power of which is derived primarily fromthe pressure afforded by a head of water, supplied by a line of pipedischarged upon it through a small nozzle, the size of which is propor-tioned to the amount of water available and the head and powerrequired. Its general form will be seen by reference to fig. 12, whichshows the wheel and its buckets, the nozzle and regulating valve orgate, and the pulley, from which the power is conveyed to othermachinery. The wheel itself is in practice hooded in with boardsor sheet iron to prevent the splash. The manner of utilising thepressure of the water in the pipes is the distinguishing feature, andthe secret of the means by which as much as 88 per cent, of thetheoretical energy of the water can be realised. i4 MACIIINEKY FOR METALLIFEROUS MINES. As will he. seen from the d
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
