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 368
aphragmmoves lever until ball fallsacross center, throwing switchopen suddenly. When pressure in tank de-creases, on account of lower-ing of the water level, lever ismoved until ball falls to theopposite side, closing switchand again starting motor andpump. The apparatus is setfor different… … FlG. 4,333.—Hill electric tank pump and method of pressure control. The illustrationshows a doable pole switch connected with a diaphragm pressure regulator, whose operationis described in the accompanying text. The switch here shown is designed for pumps upto 23^2 horse power direct current, and 5…
Electrical engineering
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