. An elementary book on electricity and magnetism and their applications. Fig. 381. — Connections for Bell deskset to be used with, common battery. 528 ELECTRICITY AND MAGNETISM. Figure 382 shows the familiar desk set of telephone portable part is the transmitter t and the receiver R hungon a hook switch. The fixed part of the set consists of a boxmounted on the wall, and in this box is the ringer r, the induc-tion coil, the condenser, and often a hand-magneto. Since the condenser is opaque to direct current andtranslucent to alternating current, no direct current fromthe centr
. An elementary book on electricity and magnetism and their applications. Fig. 381. — Connections for Bell deskset to be used with, common battery. 528 ELECTRICITY AND MAGNETISM. Figure 382 shows the familiar desk set of telephone portable part is the transmitter t and the receiver R hungon a hook switch. The fixed part of the set consists of a boxmounted on the wall, and in this box is the ringer r, the induc-tion coil, the condenser, and often a hand-magneto. Since the condenser is opaque to direct current andtranslucent to alternating current, no direct current fromthe central office will flow through the set when the hook switchis down, but an alternating current from the central office canoperate the ringer. When the bell,^7« rings and the subscriber takes theGhwl receiver off the hook, the hook switch goes up and then direct current fromthe central office flows through thetransmitter and the primary windingof the induction coil. The soundof the subscribers voice as he says Hello into the transmitter causesa pulsating current in the primarywinding, which in turn induces an alternating current in thesecondary, which is superposed on the li
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
