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BELL SYSTEM TECHNICAL JOURNAL 



nected by eight underground circuits, each consisting of 13,032 feet 

 of No. 19 gauge and 390 feet of No. 22 gauge non-loaded cable. Two 

 circuits are used for transmitting the image signals, two for the accom- 

 panying speech, one for the synchronizing current, two are used as 



Fig. 11 — Control apparatus panels associated with one terminal of the television 



apparatus. 



order wires, and one is kept as a spare. All of the circuits have identical 

 transmission characteristics, but equalization is necessary only on the 

 two which carry the image signals. Figure 10 shows the insertion loss 

 characteristic of each circuit, and also shows the insertion loss charac- 



