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 267
ar-bon b and <:, which are fastened to a thin pine-woodboard d. The microphone illustrated is in circuit withbattery B and receiver R. When the board d, is alsobrought to vibration, thus establishing a more or lessperfect contact of carbon stick a with the carbon blocks b andc, and offering the… … The telephone induction coil 213. In order to make the microphone transmitter, whichmay be operated usually with one or two battery cells, suitablefor work over long lines, electromagnetic induction is used tostrengthen the effect of the transmitter. For this purpose,especially designed induction…
Electrical engineering
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