A RAF style repro rotary dial telephone, bakelite earpiece and mouthpiece, on gilt metal column, the
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![An elementary book on electricity and magnetism and their applications. TransmitterFig. 376. Eeceiver Induction coil in local battery-telephone set.. TubeInsulatingMaterialTerminals o f PrimaryWinding Primary Winding Fig. 377. — Perspective view and An elementary book on electricity and magnetism and their applications. TransmitterFig. 376. Eeceiver Induction coil in local battery-telephone set.. TubeInsulatingMaterialTerminals o f PrimaryWinding Primary Winding Fig. 377. — Perspective view and](https://c8.alamy.com/comp/2AGEC6G/an-elementary-book-on-electricity-and-magnetism-and-their-applications-transmitterfig-376-eeceiver-induction-coil-in-local-battery-telephone-set-tubeinsulatingmaterialterminals-o-f-primarywinding-primary-winding-fig-377-perspective-view-and-cross-section-of-telephone-induction-coil-direct-current-of-low-voltage-into-alternating-currents-of-highervoltage-so-that-the-line-loss-may-be-less-the-induction-coil-alsohas-the-advantage-of-shutting-out-a-scratchy-sound-which-iscaused-by-the-transmitter-357-local-battery-telephone-set-the-commercial-telephoneset-consists-of-much-more-than-2AGEC6G.jpg)