Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 40
even approach it inefficiency and desirability. Another form of transmitter devised by Hughes, and called byhim the microphone, is shown in Fig. 19. This consists of a smallpencil of gas carbon. A, pointed at each end, and two blocks, B B,of carbon fastened to a diaphragm or sounding board, C.… … FIG. I8.-HUGHES NAIL MICROPHONE. cacy and is well termed microphone. The slightest noises in itsvicinity, and even those incapable of being heard by the ear alone,produce surprising efifects in the receiving instrument. This partic-ular form of instrument is, in fact, too delicate for ordinary use,…
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