Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 98
e. TESTING AND TESTING APPARATUS 517 The Varley Loop.—This is a method of locating a cross orground in a telephone or telegraph line or other cable by usinga Wheatstone bridge in a loop formed of a good wire and thefaulty wire joined at their distance ends. One terminal of thebattery is grounded… … Fig. 597.—Murray loop method of fault location with Leeds and Northrup fault finder:Case II, where the good and bad wires are unequal. The figure shows the connections.It is the ordinary Murray loop and it is evident that the resistance a, to the fault will beobtained from the formula a = (A -^…
Electrical engineering
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