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 544
Fig. 3,719.—Insulated rail joint at end of a block section of track. A type used for heavy mainline traffic. Insulating fibre is placed between the rail ends and clamped between the railand the joint plates and insulated bushings are placed around the bolts. INSULATION … Fig. 3,720.—Simple method of connecting a relay between insulated joints of track and forminga block signal, the circuit being closed by the train as it passes over that section of track. Ques. Name three kinds of signals in general use. Ans. Caution, stop, and proceed signals. Distant block…
Electrical engineering
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