. An elementary book on electricity and magnetism and their applications. Fig. 375. — Cross sectionof solid-back transmitter. 524 ELECTRICITY AND MAGNETISM 356. Induction coil. The current taken by the ordinarycarbon transmitter averages from to amperes. There-fore for all long-distance work the transmitter is included in asmall local circuit with a battery of one or two dry cells. Inthis circuit is inserted the primary winding of a small step-up transformer or inductioncoil. The secondarywinding of this trans-former is a coil of finewire of many turns,which transmits throughthe line
. An elementary book on electricity and magnetism and their applications. Fig. 375. — Cross sectionof solid-back transmitter. 524 ELECTRICITY AND MAGNETISM 356. Induction coil. The current taken by the ordinarycarbon transmitter averages from to amperes. There-fore for all long-distance work the transmitter is included in asmall local circuit with a battery of one or two dry cells. Inthis circuit is inserted the primary winding of a small step-up transformer or inductioncoil. The secondarywinding of this trans-former is a coil of finewire of many turns,which transmits throughthe line and receivessmaller currents at ahigher voltage. Figure 376 shows the use of such a transformerIc in a local battery set. The battery is connected in serieswith the transmitter and the primary winding; the secondaryis connected in series with the line and receiver. Figure 377shows very clearly the construction of the telephone coil. Thefunction of the induction coil is to convert the local variations of. TransmitterFig. 376. Eeceiver Induction coil in local battery-telephone set.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
