46 



BELL SYSTEM TECHNICAL JOURNAL 



10 20 30 40 50 60 



Length of Line in Miles. 



Fig. 15 — Calculated magnitude of the unbalance current for unbalance in the 

 capacitance component R and unbalance in the resistance component r of the 

 impedance of non-loaded 19-gauge cable. Testing potential 4-cycles. 



-30 -20 -10 10 20 30 



Degrees between Field Potential and Potential for Balancing r, 



Fig. 16 — Calculated sensitivity of the bridge at four cycles on a 50-mile length of 

 non-loaded, 19-gauge cable. Sensitivities for unbalance in the component: 

 I- — R with the phase of testing potential applied for balancing R. 

 II— i? with the phase of testing potential applied for balancing r. 

 Ill- — r with the phase of testing potential applied for balancing r. 

 IV — r with the phase of testing potential applied for balancing R. 



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