478 



BELL SYSTEM TECHNICAL JOURNAL 



within 3 per cent of its final value when that for the uncorrected 

 circuit has reached but half value. The initial maximum in the former 

 is similar to that in the case of a low-pass wave-filter ^^ and may be 



26 



u 

 zz 

 zo 



i 



If 



!' 







-z 



ZO 30 



Frequency (cycles per second) 



SO 



50 



Fig. 12 — Transmission characteristics of submarine cable circuit and distortion 



correcting network. 



due to the increasing attenuation beyond the equalized range. It is 

 probable that had but partial equalization been obtained without a 



IB 

 1.6 



'a 



1 

 -S 12 



.3 4 .3 



Time (seconds) 



Fig. 13 — Ratio of indicial to final voltage for (1) uncorrected and (2) corrected 



submarine cable circuit. 



^' "Transient Oscillations in Electric Wave-Filters," J. R. Carson and (). J. 

 Zobel, B. S. T. J., July, 1923. 



