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 143
MAIM LINE fPT|_ * J :§:b Ra R/7 … if jr-K IT r-=- t Fig. 3,084.—The battery polar duplex system. When the resistance of the main line is balancedby the resistance of a set of adjustable coil in the rheostat Ra of the artificial line, thecurrent will divide into two equal parts at the polarized relay, and passing around thecores in…
Electrical engineering
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