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 554
net L. De-energized armatureL-l causes contact finger I -2 to make contact with M bell circuit closed; fig, 3,736, train intrack circuit A B and B C (at crossing) relay magnet R de-energized contact finger R-2resting on L-2 bell circuit closed; fig. 3,737, train in track circuit B C relay magnet… … Fig. 3,738.—Advanced block distant signal circuit. In operation when the towerman pulls alever numbered the same as the distant signal he desires to operate, he completes a circuitbetween the two springs which causes the distant signal blade to clear.
Electrical engineering
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