46 



BELL SYSTEM TECHNICAL JOURNAL 



does not appear as large as is actually the case. In order to give a 

 better idea of the extent of the carrier application the following table 

 has been prepared which lists all the systems shown on the map and 

 totals the channel miles obtained by each system. The telegraph 

 channels if placed end to end would circle the globe 3 times and 

 the telephone channels would extend somewhat more than half way 

 round. 



Carrier Telephone System 



Harrisburg-Chicago 



Boston-Bangor 



San Francisco-Los Angeles 



Harrisburg-Detroit 



Boston-Burlington 



Oakland-Portland 



Pittsburgh-Chicago 



Chicago- Detroit 



Total 



Channels 



29 



Miles 



742 

 250 

 446 

 605 

 284 

 735 

 552 

 327 



3,941 



Channel 

 Miles 



2,968 

 1,000 

 1,784 

 1,815 

 284 

 2,205 

 3,312 

 1,308 



14,676 



Carrier Telegraph System 



Washington-Atlanta 



Harrisburg-Chicago 



( )akland-Portland 



Chicago-Omaha 



Chicago-Pittsburgh (Via Terre Haute) 

 Chicago-Pittsburgh (Via Indianapolis) 



Key West-Havana 



Chicago-Minneapolis 



Chicago-St. Louis 



St. Louis-Kansas City 



Omaha-Denver 



Denver-Salt Lake 



Salt Lake-Oakland 



San Francisco-Los Angeles 



Total 



Channel 

 Miles 



5,176 



13,482 



7,350 



9,900 



12,680 



4,704 



345 



4,240 



3,330 



2,940 



5,840 



4,640 



4,626 



4,460 



83,713 



Typical Cases — Telegraph 



It will perhaps be of interest to consider several typical cases of 

 carrier installations in order to see the economies involved in pro- 

 viding circuits by carrier rather than by other methods. Taking 

 first the carrier telegraph systems as the considerations involved 



