. The Bell System technical journal . CONDUCTORUNDER TEST PROTECTIVE< RESISTANCE -=- 500^ VOLTS-[-DC ^ Fig. io—Shielded insulation resistance test circuit. device to replace the telephone receiver as a means of indicatingbridge balances. The visual bridge balance indicator used consistsessentially of a vacuum tube circuit in which the alternating current — NOTES — 1 - SET RESISTANCE OF (A) EQUAL TO LENGTH OF CABLE 2 - BALANCE OUT LEAD RESISTANCE WITH (B)3-READ OHMS PER MILE AT eS^F FROM (C). SWITCH FOR MAKINGPRELIMINARY BALANCE Fig. 34—Conductor resistance measuring circuit. 5e// Sys. Tech.
. The Bell System technical journal . CONDUCTORUNDER TEST PROTECTIVE< RESISTANCE -=- 500^ VOLTS-[-DC ^ Fig. io—Shielded insulation resistance test circuit. device to replace the telephone receiver as a means of indicatingbridge balances. The visual bridge balance indicator used consistsessentially of a vacuum tube circuit in which the alternating current — NOTES — 1 - SET RESISTANCE OF (A) EQUAL TO LENGTH OF CABLE 2 - BALANCE OUT LEAD RESISTANCE WITH (B)3-READ OHMS PER MILE AT eS^F FROM (C). SWITCH FOR MAKINGPRELIMINARY BALANCE Fig. 34—Conductor resistance measuring circuit. 5e// Sys. Tech. Jour., July, 1922: Measurement of Direct Capacities, G. Transactions A. I. E. E., \ol. XL\l, May, 1927: High FrequencyMeasurement of Communication Apparatus, W. J. Shackelton and J. G. Ferguson. 466 BELL SYSTEM TECHNICAL JOURNAL MILLIAMMETER
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