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 49
!LI5TEN!N& key MAINSTATION!; WLDGL Of PLUNGER GENERATORAffMATuREMAGNETS … RING_ CONNECTIONJt^5PRING CONNECTION Fic. 2,948.—Wiring diagram showing two common battery instruments wired so that onlyone bell at a time can be rung by central. With the listening key normal (as shown)central can ring only the main station bell but the extension can talk, and by throwingthe…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
