456 



BELL SYSTEM TECHNICAL JOURNAL 



The actual reproduced pictures considerably exceeded this range; in 

 fact a brightness ratio of 50 or 100 to 1 was realized. In these tests 

 it was found desirable to hold random interference down about 40 db 

 below the maximum signal, and pattern interference down at least 

 15 db more. 



Fig. 16 — Photograph of a two million cycle amplifier under development for 

 experiments on the coaxial cable. 



The engineers who worked on the system, and outside experts who 

 observed it, expressed the opinion that the reproduced pictures in 

 Philadelphia were substantially the same as those seen on a similar 

 receiving device in New York, thus showing that the cable system 

 itself introduced no appreciable distortion. 



