Elementary treatise on electricity and magnetism (1903)
Foster, George Carey, 1835-1919, Joubert, Jules François, 1834-1910. Traité élémentaire d'électricité, Porter, Alfred William, 1863- joint author · London, New York, Longmans, Green, and co. · leaf 552
are to be retained,and therefore the clearness and quality of the original sound, thevariation of the telephonic currents must be a very small fractionof their mean strength. The form of the original microphone has been variously modified.It is desiiable to increase the number of contacts, so as to… … Fig. 358. 530 TECHNICAL APPLICATIONS [462- obtained by using small fragments or filaments of carbon. Oneof the best microphones consists essentially of a thin plate ofcarbon resting on a packing of the filaments of incandescentlamps. 463. Transmission by the Telephone.—In the telephone, which is an…
Electricity · Magnetism
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