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 57
ulses and goes out through the line when the ringingkey is depressed as the positive current. For the negative side of theline the reverse is true. Ringing lead wires are connected to the battery which has its positivepole toward the source of alternating current and gives alternatingcurrent… … IP 5HUTTER-J[*^k!—I2V0LT5 D.C JELL Hgconz RINGINGK£Y MAGNETC0R£ -r?? Tfr- HANDGENERATOR 1-
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
