Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 325
roximately one-half, thus permitting lighter and morecompact construction. ELECTRIC PUMPS 2,979 In the double acting pump there are no bucket valves, a solid pistonbeing used. The essential features and operation are plainly shownin figs. 4,259 and 4,260. There are two inlet valves A, B, and two… … Fig. 4,261.—Air and vacuum chambers. The air chamber is for the purpose of introducing anair cushion to counteract the solidity of the water, thus preventing shocks as the waterflows through the valves. Similarly, a vacuum chamber is sometimes attached to thesuction pipe. When the column of water…
Electrical engineering
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