Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 504
TRANSMITTER. 493 bon resting lightly in small holes in the two carbon supportsA, B, carried by a light sounding board, I). Any slightvibration experienced byD will vary the contactresistance at the points of(7, and give rise to soundsof considerable intensityat the telephone T. … 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.
Physics
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