. Multiplex combinations for economic telegraphy and telephony . prrfS mf \XSlASlXI/1\MXXSJJ -mnrnvin irw rOTnrrvw-rprrrri <3 PS ^ i .S3 8- 42 V. #16. V Considerations necessary in External Line Construction. When electric circuits are in close proximity, they inducecurrents in each other. This inducing action of one circuiton another is spoken of as mutual induction. The fact that anem. f. is induced in one circuit by another iB explained by thesame reasdn that an is induced in the secondary of a trans-former, when a pulsating or alternating current is impressedon the primary of the
. Multiplex combinations for economic telegraphy and telephony . prrfS mf \XSlASlXI/1\MXXSJJ -mnrnvin irw rOTnrrvw-rprrrri <3 PS ^ i .S3 8- 42 V. #16. V Considerations necessary in External Line Construction. When electric circuits are in close proximity, they inducecurrents in each other. This inducing action of one circuiton another is spoken of as mutual induction. The fact that anem. f. is induced in one circuit by another iB explained by thesame reasdn that an is induced in the secondary of a trans-former, when a pulsating or alternating current is impressedon the primary of the same transformer. This mutual induction is very detrimental to telephonelines,since a receiver is a very sensitive apparatus and willgive an audible sound by a very small fraction of a milli-ampere. The foreign noises heard in the receiver may be due toone or more of several causes* The sudden shifting of theearths magnetic field may induce currents in the line; earthcurrents, due to difference in potential between the ground platesat the ends of the lines, may also pass through the telephoneinstruments producing the same results; there may
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelephone, bookyear19
