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 66
THE FOLLOWING, NUMBER OF IMPROVED BLUE BELL DRVBATTERIES CONNECTED IN SERlES.WILL BE REQUIREOFOR THE LENGTHS OF LINE SHOWN BELOW > RINGING BATTERY Z*N^1+TALKING BATTERY ZINC- TALKING BATTERY RINGING BATTERY CIRCUIT DIAGRAM FOR A COMMON RETURN SYSTEM? LENQTHSOF LINE BATTERIESREQUIRED… … TALKING BATTERY KINGING BATTERY IG. 2,971.—N. Y. Telephone Co. intercommunicating system. The wires connecting threestations are shown, also the talking and ringing batteries. Wires from the mam cable arebrought to lugs in each telephone and connected underneath the screw heads shown, in-strument…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
