. American telephone practice . GROUNDED AND METALLIC LINES. circuit line will pass through winding, 1, of the repeating coil in thecord circuit, thereby inducing similar currents in winding, 2, whichwill flow through the circuit of the grounded line. This circuit maybe traced from ground at the central office through the sleeve con-tact wTith the jack and plug through the winding, 2, of the inductioncoil, thence through the tip of the plug and jack to line and toground at the subscribers station. The only objection to the plan shown is that it is sometimes neces-sary for the operator to chang
. American telephone practice . GROUNDED AND METALLIC LINES. circuit line will pass through winding, 1, of the repeating coil in thecord circuit, thereby inducing similar currents in winding, 2, whichwill flow through the circuit of the grounded line. This circuit maybe traced from ground at the central office through the sleeve con-tact wTith the jack and plug through the winding, 2, of the inductioncoil, thence through the tip of the plug and jack to line and toground at the subscribers station. The only objection to the plan shown is that it is sometimes neces-sary for the operator to change cords; for instance, if she hadanswered with the plug belonging to the pair of metallic circuitcords and found that the call was for a grounded line, she wouldhave to change the answering plug, using one belonging to the com-bination pair of cords, as shown in Fig. 176. In order to obviatethis, what is termed a repeating coil key is sometimes used in con-nection with all the cord circuits, this key being similar in con- j^r^m. Drop. **4 Call.
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