566 



BELL SYSTEM TECHNICAL JOURNAL 



provide the greatest economies. Their use is, of course, restricted 

 to sections of the country in which open-wire construction is chiefly 

 employed.^ They have contributed toward lowering the cost of 

 service and in making possible the toll rate reductions which have 

 been put into effect within the past year or so. 



280,000 



240,000 



f^20 0.000 



_r 

 u 

 z 

 z 

 < 

 I 

 o 



160,000 



120,000 



ao.ooo 



40,000 



Figure 1 — Growth of carrier telephony in Bell System 



New System Replacing Older Types. The new type "C" system is 

 essentially a long-haul, multi-channel system. It adds three high 

 grade telephone circuits to the facilities normally afforded by a single 

 pair of wires, and can be used over any distances likely to be en- 

 countered in the Bell System. Where repeaters are required they 



' In localities having very lieavy traffic requirements such as in tiie East, extensive 

 use is made of toll cables. 



