Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 244
LOCATING FAULTS IN WIRES. 221 nected in series with the primary of C and a fewcells of dry battery. When a balance is obtainedthere will be no noise in telephone receiver T, andA will then bear the same inverse ratio to R asL does to a, hence the formula F=- AxL or 1000 X 250 = 62.5 feet, R ~*… … Fig. 127. In this case C is a standard condenser, againstwhose capacity we are measuring the capacity ofthe good conductor in cable. Let us call the capacityof C 1 M.F. Then say it takes 4000 ohms in R tobalance the system so that there will be mini-mum noise in T. Then C=lx R or 1 X 10004000 -.25…
Electric testing · Electric apparatus and appliances
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