280 BELL SYSTEM TECHNICAL JOURNAL 



These constants have the values 



a = hu, — (tu, + r,/), 



b = K„ 



C = //,„ + (r + r'). 



Case II. By the same method the regions of integration are 

 determined to be, for lasting lockouts 



y < a, b < X < c, 



y < a, y — a-[-b<x<y — a-\-c, 



for releasing lockouts, blocked by hw, 



y < a, jS < X < 00 , 



for releasing lockouts without blocking, 



a < y < a, i3<x<oo, 



in which a and ^ are defined by 



a = he - T - (t,, + r,/), 

 i8 = he. 



Case III. As before we obtain the regions, for lasting lockouts 



y < a, b < X < 13, 



a < y < y, y — a -\- b < x < (3, 



y < y < <x> , y — a -\- b < X < y — a -\- c, 



for releasing lockouts blocked by hw and he, 



y < a, i3<x<<x>, *** 



for releasing lockouts blocked by he, 



a < y < y, /S < x < oo , 

 for releasing lockouts without blocking, 



7<3'<a, ^ < X < -X) , 



in which a and j8 have the values given above and 

 T = /^a - (r + r') - (r + r,/). 



