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
r. The circuits combined here arethe same as those shown in the switchboard diagram where only one extension jack and onepair of cord are connected. 2,134 HAWKINS ELECTRICITY Ques. In the wiring of a multiple switchboard, foreffecting the multiplications of the jack connections,how is each… … Fig. 2,939.—Modern ringing keys. In order to meet the needs of every calling subscriber, theoperator must perform several different acts in shifting and changing circuits and tofacilitate this work devices to simplify it as much as possible have been developed. Themodern ringing keys have greatly…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
