. Electrical instruments and telephones of the Signal corps . FiG. 162. cent wires of the multiple cable, the lower end of the battery shouldbe joined to the other faulty wire instead of the cable sheath Fig. 163. When balance is obtained, note the reading on the resistance wirefrom point C. Call it A. Then if length of faulty conductor is L ALfeet, the distance of the fault from C is —-r- feet. 248 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. This method is particuhirly applicable to paj^er cables where a leakhas made the insulation of all the conductors faulty. Loedtioii of hre
. Electrical instruments and telephones of the Signal corps . FiG. 162. cent wires of the multiple cable, the lower end of the battery shouldbe joined to the other faulty wire instead of the cable sheath Fig. 163. When balance is obtained, note the reading on the resistance wirefrom point C. Call it A. Then if length of faulty conductor is L ALfeet, the distance of the fault from C is —-r- feet. 248 ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. This method is particuhirly applicable to paj^er cables where a leakhas made the insulation of all the conductors faulty. Loedtioii of hreal in rondurfor.—The method ap]-)licable when thewire is broken inside the insulation, leaving the latter intact, is givenbelow. This is the character of the fault generally produced when aconductor parts in a paper cable. Owing to the small capacity of thiskind of cable the metliod is useful because of the practical difficultyin getting correct capacity values by galvanometer methods in smalllengths of this cable. The connections for the test are the same as that described in figureIGl, except the telephone receiver is used in place of the point ff. instead of representing a fault in insula
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