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- · New York, T. Audel · leaf 318
ere, Itheseinstrumentsarenearly Iall based on a measurement Iof the pressure differbetween each pole and earth, two measurements being re-quired for two wire systems,and three for three wire,whether direct current singlephase, or polyphase alternatingcurrent. Inthecaseof directcur-rent systems, the… … F:g. _\5:>0. Westinghouse single phase electrostatic ground detector. main showing the smallest pressuredifference to earth must be taken asbeing the worst insulated. _ For I mov- ing coil (for alternating current)- moving ircn instruments(for direct current) are themost used, while for high…
Electrical engineering
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