The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 476
f 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 The resistance obtained, divided by the… … Fig. 422.—Connections for Loop Test. Alternative Form is high, however, it becomes necessary to use a strong batteryin order to obtain reliable results. Fig. 422. shows another plan of loop test which is sometimespreferred, or may be used to check the figures arrived at bythe first plan. In this…
Telephone
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