TELEPHONE SYSTEM OF THE UNITED STATES 



41 



about five per cent of the business is in the form of sequence calls, 

 some of the sequence lists including as many as 1,000 calls. 



Except during times of emergency conditions, it is not the practice 



800 



600 



400 



200 



Fig. 32 — Toll board messages per year in thousands, New York-Boston. 



in the United States to limit the length of conversations on toll con- 

 nections. As a result it is very general for conversations, particularly 

 on longer hauls, to exceed the initial three-minute period, the average 

 length for transcontinental conversations being, for example, six 



