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
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. … Fig. 3,739.—Distant signal and repeater circuit. Here, through a lever connection, when the leveris pulled out in the tower, current is allowed to flow to and complete a circuit through acontact spring operated by the signal mechanism. As soon as the distant blade clears,according to this circuit,…
Electrical engineering
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