Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 504
448. Transmitter. — In the service of publictelephone exchanges, themagneto - electric instru-ment of Fig. 319 is used solely as a receiver in connection with a transmitter operat-ing on the principle of the microphone. Fig. 320. … Fig. 321. In a very successful transmitter, known as the Hmmingstype, the fluctuations of the battery current are produced by 494 TELEGRAPH AXD TELEPHOXE. passing the current from a diaphragm which is set vibratingby the voice, through a layer of hard carbon granules looselvarranged. Fig. 321…
Physics
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