Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 154
n hundred words have been transmittedover a single wire in one minute. 44T. Electric Bells.—The construction of thetrembler or electric bell will be clearly seen by an exam-ination of Fig. 232. When the button at P (anywhereon the circuit) is pushed, two metal pieces are broughtinto contact and the… … Fig. 232. {a.) When the spring rests against the end of the screw at (7 (thecircuit being closed at P), the cores of E are magnetized. Theythen draw the armature away from the end of the screw and breakthe circuit at C Ey being thus demagnetized, no longer attracts itsarmature, which is thrown back…
Electricity · Magnetism
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from The Telegrapher [microform] (1864)](https://img.insideoutlibrary.com/img/200/ia-telegrapher05nati-144-90.webp)
