Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 266
e coil of a receiver. ELECTRICAL ENGINEERING 263 Being compelled to overcome a greater or a lesser resist-ance between c and e, the strength of the magnet of thereceiver decreases or increases, thus producing the originalsounds as described in § 209. There are many different systems of transmitters… … Microphones 212. A device for ren-dering faint or distantsounds distinctly audible, &is called a microphone.The principle of the mi-crophone is shown in fig.117. It consists of astick of carbon <?, whichbeing cut to sharp pointson both ends, is held loosely, between two blocks of car-bon b…
Electrical engineering
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