Elementary treatise on electricity and magnetism : founded on Joubert's "Traité élémentaire d'électricité" (1909)
Foster, G. Carey (George Carey), Porter, Alfred William, 1863-1939, Joubert, Jules François · London : Longmans · leaf 596
ents are to be retained,and therefore the clearness and quality of the original sound, thevaiiation of the telephonic currents must be a very small fractionof their mean strength. The form of the original microphone has been varioiisly modified.It is desirable to increase the number of contacts, so… … Fig. 358. 574 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
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-674-295.webp)
