Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 643
pplied to the ear of a listener, he will distinctly hear every word pro-nounced by one speaking near the microphone, even in a low tone ; but aloud voice may be heard when the speaker is 20 or 30 feet from theinstrument. The minutest vibrations conveyed to the stand are perceivedat the receiver as… … Fig. 302^.—Mr. Hughes Microphone.{b and R are merely diagrammatic.) touch of a feather on the stand is distinctly audible, and a current of airimpinging upon it is reproduced as the noise of a stream of water. Themicrophone is, in fact, the most sensitive detector of vibrations that isknown, and…
Inventions
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-96-33.webp)
