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 274
I HEAVY! DUTY BELL CONDENSER EXTRA HEAVYDUTY BELL CONTACT BREAKER COMTACT MAKER … 5T0P COMTACT MAKER CONDEMSER Figs. 3,238 to 3,240.—Suggestions for the prevention of sparking on special bells. Fig. 3,238contact maker and shunt circuit for medium duty bell; fig. 3,239 contact breaker andcondenser for heavy duty bell; fig. 3,240, contact maker and condenser for extra heavyduty…
Electrical engineering
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