LEAD-COVERED PAPER-INSULATED TELEPHONE CABLE 433 



General Information on Use of Cahle 



The rapid increase with which cable is being added to the toll plant is 

 illustrated quite strikingly by Fig. 1 , which shows the present and 

 proposed increases in cable in comparison with open wire and carrier 



1930 1931 



YEAR 



1933 



Fig. 1 — Present and proposed increase in cable in comparison with open wire and 



carrier circuits. 



circuits.^ The future scope of this expansion is shown by Fig. 2, which 

 indicates the present and proposed main toll cable routes in the United 

 States. The exact program on which these cables will be extended 

 will depend upon how rapidly the business develops; howe\'er, definite 

 future plans have been outlined to extend the cable to (3maha, Ne- 

 braska,** and across the continent to San Francisco, thus replacing 

 and increasing the capacity of existing open wire lines. 



^"Recent Developments in Toll Telephone Service" by W. H. Harrison, Jour. 

 A. L E. £., March, 1930; Bell Telephone Quarterly, April, 1930. 

 ** This cable was completed in ^Iay, 1931. 



