Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 221
lel, across the line.244. The Telephone. —The telephone uses Figure 225. — APortable Tele-phone Receiverand Trans-mitter. the principle ofthe transformer.Figure 224 showsa diagram of thesimple Bell tele-phone. In the trans-mitter is a layerof powdered car-bon (0) betweentwo plates (P andP). By this… … Figure 226 —A Desk Telephone Switchboardsuch as is Used as a Local Switchboard bya Large Business Concern. THE TELEPHONE 211 being put in series : (a) the secondary coil of the local trans-former, (b) the secondary coil of the transformer at theother station, (c) the coil of wire about the…
Physics
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