74 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1956 



Fig. 4 — Effect of regeneration on disturbances which occur at only one re- 

 peater. A — Input to regenerator, original signal. B — Output of regenerator, 

 first trip. C — Output of regenerator, 24th trip. 



Fig. 5 — l']ffect of regeneration on disturbances which occur at only one re- 

 peater. A — Input to regenerator, first four groups. B — Output of regenerator, 

 first four groups. C — Output of regenerator, increased input level. 



