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 268
llows: ELECTRIC BELLS 2,359 1. Current flows through the magnetizing winding and energizes magnet; 2. Magnet attracts the armature; 3. Contact maker closes circuit through demagnetizing coils; 4. Demagnetizing coils demagnetize the magnet; 5. Armature spring pulls armature back against the stop,…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)](https://img.insideoutlibrary.com/img/200/ia-cu31924022817674-64-23.webp)
