. American telephone practice . The actual circuits of such a systemadapted to common battery talking and signaling is shown in Fig. 325- This, as will be seen, employs four ringing keys, 1, 2, 3 and 4, inthe cord circuit, the operation of any one of which will cause thebell of the correspondingly numbered station on the line with whichthe calling plug is connected, to ring. Thus, depressing key, I, willthrow positive pulsations from the generator on the sleeve side, a,of the line, at the same time grounding the tip side, a!. This willcause the bell at station 1 to ring. Similarly any of the o
. American telephone practice . The actual circuits of such a systemadapted to common battery talking and signaling is shown in Fig. 325- This, as will be seen, employs four ringing keys, 1, 2, 3 and 4, inthe cord circuit, the operation of any one of which will cause thebell of the correspondingly numbered station on the line with whichthe calling plug is connected, to ring. Thus, depressing key, I, willthrow positive pulsations from the generator on the sleeve side, a,of the line, at the same time grounding the tip side, a!. This willcause the bell at station 1 to ring. Similarly any of the other sta-tions may be called up. In order to prevent undue complication of the ringing keys, and tobring about the further advantage of having a party line handled, sofar as the operator is concerned, in exactly the same manner as ifit were an individual line, Mr. F. R. McBerty, of the Western Elec-tric Company, has proposed a very ingenious system, shown in This uses a separate jack on the switch-board for every sub-. FIG. PARTY LINE PARTY LINE SYSTEMS. 437 scriber on the party line; thus, on a four-party line four jacks wouldbe used for each line, instead of one, as in the original Hibbard sys-tem. The arrangement of the subscribers apparatus with respect to theline is the same in all respects as in the system just described, andthe operation of calling central is obvious from the diagram. In connection with the line conductors, a and a are four spring-
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