Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 348
construc-tion of the transmitter, so that the sound of the voice isonly required to regulate or vary an electric current alreadygenerated by a battery, instead of being used to generate thecurrent. The general arrano^ement of two telephone stationswill be understood from Fig. 297. Each transmitter… … 298.—Telegraph Trans-mittiflg Key. other, and are connected in series with a battery circuit andthe primary of a small induction coil. Sound waves cause a vibration of the diaphragm, D, andthe varying pressure it exerts between the carbon button andthe hammer, causes variations in the battery…
Electricity · Magnetism
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