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 41
eys have greatly helped in the saving of the operators time. By throwingthe little levers a hard rubber bushing makes or breaks the contacts at the springs andthrows alternating current ringing power into the line. When the ringer pressure is re-leased, the levers fly back again into normal… … Fig. 2,940.—Mounted trunk drops. Tubular trunk drops are mounted on a metal strip eachbeing held by two small screws underneath the drop shutter. The tubular casing of eachdrop is soft iron inside of which is the drop winding, the ends of the coil wires terminatingat lugs which protrude from the…
Electrical engineering
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