. The Bell System technical journal . Fig. 9—Condenser arrangement for neutralizing sending-end crossfire between tele-graph circuits on a phantom group OP CROSSFIRE 429 The result of transposing is that for practical purposes in connectionwith the crossfire problem the other wires of the line can be ignoredand a phantom group represented by a network of admittances asshown in Fig. 8, where 1 and 2 represent a i)air and 3 and 4 the otherpair. A network of the form of Fig. 8, is used as shown in Fig. 9, forneutralizing sending-end crossfire among the four wares of a
. The Bell System technical journal . Fig. 9—Condenser arrangement for neutralizing sending-end crossfire between tele-graph circuits on a phantom group OP CROSSFIRE 429 The result of transposing is that for practical purposes in connectionwith the crossfire problem the other wires of the line can be ignoredand a phantom group represented by a network of admittances asshown in Fig. 8, where 1 and 2 represent a i)air and 3 and 4 the otherpair. A network of the form of Fig. 8, is used as shown in Fig. 9, forneutralizing sending-end crossfire among the four wares of a phantom t 90 VoltsGroundedBatteries Receiving-end Crossfire Neutralizer ■4-windinq trarisformer; mutualinductance = henri/ betweenedch pair of^ vHndinqs;cuTent fromodd to even numbered terminal5qnetizes core in same-idireclionrnailCdtet, Polar Duplex Seli. Fig. 10—Arrangement for neutralizing crossfire between telegraph circuits on aloaded No. 13 Ga. phantom group 90 to 120 miles long in cable group. The grounded branches shown in Fig. 8 are omitted, however,since the duplex artificial lines themselves constitute these six-mesh network consists of condensers, the timing resistancesw^hen used being external to the network as a matter of coupling together the apex circuits of the four wires to neu-tralize receiving-end crossfire, it is possible to use a special four-winding transformer analogous to the six-condenser network, butwhere an ordinary transformer as shown in Fig. 10 will not sufificeit is convenient to employ two or three transformers in example a two-winding transformer may be added to each pairof the arrangement illustrated in Fig. 10 so as to pro\ide additionalcoupling between the two wires of a pair. 430 BELL SYSTEM TECHNICAL JOURNAL It will readily be seen that with
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
