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 149
Telegraph. — The electrictelegraph consists essentially of an electro-magnet and a^^key placed in the circuit of a battery. The key is an instrument by whichthe circuit may beeasily broken or closedat will. The armature,Ay of the ^registermagnet, M, is sup-ported by a spring, S,which lifts it when… … Fig. 228. MA GNETtSM. 319 armature may act upon one arm of a lever, the other endof which, being provided with a style or pencil, P, may bepressed against a paper ribbon, R, drawn along by clock-work. Thus, the pencil may be made to record, upon themoving paper, a series of dots and lines at the…
Electricity · Magnetism
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