. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Peltonsupplies the mill with washing water for the concentration machinery. The Riedler Air Compressor.—In air compressors of the ordinarytype, the inlet and outlet valves are opened automatically by the pressureof the air against the action of springs, which must be of sufficient strengthto close them against the currents of air passing them. If the valves areheavy, the springs must also overcome their inertia; combining theseforces, the action of the springs causes the valves
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. Peltonsupplies the mill with washing water for the concentration machinery. The Riedler Air Compressor.—In air compressors of the ordinarytype, the inlet and outlet valves are opened automatically by the pressureof the air against the action of springs, which must be of sufficient strengthto close them against the currents of air passing them. If the valves areheavy, the springs must also overcome their inertia; combining theseforces, the action of the springs causes the valves to oscillate violentlywhen they are open, which not only restricts the area of opening, butdestroys the valves and seats themselves. To mitigate these evils, the number of valves is increased, whichresults in extra cost of manufacture and maintenance. Since their motion at moderate speeds is so violent, high speed ispractically out of the question, and wide seats become necessary toprevent undue wear and tear, which, while-prolonging the life, introducesanother serious evil, which may be described as [PLATE III.
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