. American telephone practice . FIG. 125.—WIRING OF DESK SET. duction coil on the connecting rack, the four wires leading to theprimary and secondary of this coil may be connected permanently LOCAL BATTERY SUB-STATION EQUIPMENTS. 149 to their respective binding posts on this rack, thus somewhat sim-plifying the external wiring. Still another arrangement of desk stand wiring is that whereina separate connecting rack without induction coil is used, the in-duction coil being carried in the generator box. The circuit ar-rangement for this or any other modification may easily be workedout from the
. American telephone practice . FIG. 125.—WIRING OF DESK SET. duction coil on the connecting rack, the four wires leading to theprimary and secondary of this coil may be connected permanently LOCAL BATTERY SUB-STATION EQUIPMENTS. 149 to their respective binding posts on this rack, thus somewhat sim-plifying the external wiring. Still another arrangement of desk stand wiring is that whereina separate connecting rack without induction coil is used, the in-duction coil being carried in the generator box. The circuit ar-rangement for this or any other modification may easily be workedout from the diagrams shown. For bridging instruments, the Bell companies usually employ thecircuit arrangement shown in simplified form in Figs, in and 112, 4-ConductorCcrd-ZT
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