Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 627
circuit with abattery and a telephone used as a receiver. The springpresses B against A, and any slight jar will cause a variationin the pressure and corresponding variations in the currentstrength. By means of this instrument, called the microphone, anylittle sound (as its name indicates) such as… … V III lI j,i|ih I ElO. 491. 655. Bells photophone or radiophone. This is an instrument by means of which sound-waves may hegenerated by rays of light, and speech be transmitted through theinstrumentality of ether-vibrations. Kays of light of the sun, anelectric lamp, etc. fall upon a mirror M (Fig.…
Physics
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