280 BELL SYSTEM TECHNICAL JOURNAL 



These constants have the values 



a = Kc — {tw + r,„'), 



h = h^, 



C = hu, + (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, j8<x<oo, 



in which a and /3 are defined by 



a = he — T — {Tw -\- T,J), 

 13 = he. 



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



y < a, b < X < 13, 



a < y < y, y — a-\-b<x<^, 



y < y < <x) , y — a-\-b<x<y — a'\-c, 



for releasing lockouts blocked by //,„ and he, 



y < a, /3 < X < cc , 



for releasing lockouts blocked by he, 



a < y < y, (3 < x < ^ , 

 for releasing lockouts without blocking, 



7<3'<q:, /3<X<co, 



in which a and /3 have the values given above and 

 y = he- {r + r') - (r + r,/). 



