430 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1956 



8 



If) 



o 



0> 





o 



(0 



(O 



o 



If) 



o 



in 



o 





o 



in 

 tvj 



o in 



SBIONII^ 1- a3AO SidlAjaiiV dO iN3D«3d 



