Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 551
ts 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… … Fia. 358. 530 TECHNICAL APPLICATIONS [462- obtained l)y 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…
Electricity · Magnetism
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