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 126
d for temporary purposesand is so called because it requires the constant attendance of an operatorto change the position of the button switch, in accordance with thedirection in which the message is passing. The automatic repeaterrequires no attention other than that necessary to insure the… … GROUND GROUND pG. 3,064.—Diagram of the Postal telegraph repeater system. The Postal direct point duplexrepeater is an arrangement by which the respective armature levers of two polar relaysat the repeater office connect the positive and negative main battery currents direct tothe line wires. Its…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
