. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. passes, bythe pipe (d), to the upper part of the regulating cylinder (l), and acts on a piston (m) therein toreduce the supply. Should the speed decrease, the water passes bythe pipe (e) to the lower part of the cylinder (l), and raises the pistonand permits more water to enter the motor, so as to maintain its normalspeed. When a turbine or a Pelton wheel is working under a high fall, asmall pipe from the supply will be sufficient for working the governor; butwhere the fall is
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. passes, bythe pipe (d), to the upper part of the regulating cylinder (l), and acts on a piston (m) therein toreduce the supply. Should the speed decrease, the water passes bythe pipe (e) to the lower part of the cylinder (l), and raises the pistonand permits more water to enter the motor, so as to maintain its normalspeed. When a turbine or a Pelton wheel is working under a high fall, asmall pipe from the supply will be sufficient for working the governor; butwhere the fall is low it is worth while to put in a pressure pump to workthe governing cylinders. I have used a regulator of the above type, as shown in fig. 316 (p. 489)5to govern a 420 horse-power turbine running at a speed of 450 revolutionsper minute under a head of 80 ft., used for driving a generating dynamowhere regularity of speed was essential; and another to govern the speedof a 168 horse-power Pelton wheel (Plate II.), driving a concentrating milland air compressors. In both cases the results were highly ^-^^ Fig. The Murray Hydraulic Governor. 12 MACHINERY FOR METALLIFEROUS MINES. The illustrations in Plate I. (p. 8) are from the working drawingsof a double vortex turbine which I erected at a lead and blendeconcentration mill in AVales in 1899, supplied by Messrs. GilbertGilkes & Co., of Kendal, of which the specification is given below. Thiswheel was not supplied with a governor, but the guide-blades wereconnected to a hand-wheel, fixed in the interior of the mill, by meansof which, once the water was turned on at the main sluice, the wheelcould be started, stopped, or its speed controlled. The steel pipes wereburied for the whole of their length, and started from a wooden tank inwhich was a grating to prevent the entrance of leaves or rubbish. Thesand and gravel in the water were caught previously in a settling tank,at the bottom of which was a sluice continually ope
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