318 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 



T 



•^ I i| 



^^A^^^|lHl' 



I^AArH|lHl 



P;II 



050 



< Oq 



IS - 



</) LU: 

 liJ (T^ 

 Q < I 



Hi 



Hi' 



Tnii Hi' 



