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 50
ll not ring. With the keys normal, the mainbell is rung by central. If a key be thrown, the bell at that station will be rung by central.The position of the ringing key determines which extension bell is to be rung by the handgenerator, for by this arrangement the system is intercommunicating, and… … LISTENINGKEV EXTENSIONSTATION
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
