56 



THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952 



seconds represents actions of subscribers who would disconnect if dial 

 tone were delayed indefinitely. Curve C and its extension is the sum of 

 the other two. Curve D in the region beyond t = 5 seconds represents the 

 actions of subscribers who disconnect after tone, curve E represents the 

 actions of subscribers who will dial their calls after tone and curve F 

 represents the sum of the lower curves. Of interest is the fact that for an 

 interval of about two seconds following dial tone (at i = 5 seconds), 

 the observed total survivor curve F lies above the extended portion of 



005 



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