Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 375
nger-nail a very harsh grating sound is produced in the telephone,while the ticking of a watch is heard with remarkableloudness. In more sensitive forms of the instrumentthe walk of a fly over it is said to suggest the tramp of aregiment. The forms of the microphone are infinite. A jar of… … Fig. 284. The invention of the microphone following rapidly on thatof the telephone, led to attempts to use some form of themicrophone as a transmitter, and the telephone as a receiveronly. This idea though present in the loose platinum contactof the Eeis receiver has received its practical…
Electricity
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