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BELL SYSTEM TECHNICAL JOURNAL 



minutes. Conversations which run one half hour or an hour are not 

 unusual, and in one case a transcontinental telephone conversation 

 was eight hours in all. 



A striking feature of the long distance service is the more rapid 



3 50 



300 



250 



Fig. 2>i — -Toll board messages per year in thousands, New York-Chicago. 



growth of very long haul business than business of moderate length. 

 Figures Zl, 33) and 34, for example, show respectively the growth in 

 messages for the last five years between New York and Boston, 370 

 kilometers. New York and Chicago, 1,380 kilometers, and the trans- 

 continental business between New York and Chicago at one end and 



