The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 476
en, in having the carbon end of the batterytaken off and put directly to earth. It may be necessary toreverse the line connections before a balance can be obtained,in order to get the faulty wire on terminal e. Supposing thetop arm ratios are equal when a balance is obtained, we shallhave the… … <X-II3 LOOP =I7S^L i 1 X = 65u 3 -Connections of Wheatstone Bridge for Loop Testfor Leakage Fault able arm (it). Knowing the resistance of the loop (I),measuring it in the ordinary manner, we shall then have From y = x + r and l = x + y R or we nave x = —^— - r = -With unequal arms x = b~R a + b…
Telephone
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