GOO 



THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 



G = 



1 - o-X 



1 - X2 



Fin 



X2 



1 - (7X 



1 



for all values of X, cr from — oc to + <x , ro being kept fixed. This can 



be clone as accurately as desired by first drawing the contours x^ = 



1 — X^ 



= constant (Fig. 4), along each of which G simply behaves like 



1 — crX 



A/\ + B and is easily evaluated with the help of a table of F. However, 



Fig. 4 — Curves of constant x^ = 



1 - o-X 



in the cr — \ plane. 



