1158 THE BELL SYSTEM TECHNICAL JOURNAL, SEPTEMBER 1954 



2.0J 1.6J 1.2J 0.8J 0.4J 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 



X 



Fig. oc 



• 



« 

 • 



• 



/ » 



1.0J O.ej 0.6J 0.4J 0.2J 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 



X 



Fig. 5c1 

 Fig. 5(c), top and (d), bottom — See Fig. 5. 



Near re = 1 (corresponding either to small^ or to sufficiently large c), 

 $ differs from its value $o for the isotropic case by a small amount 5$. 

 The rotation, to first order, is then just one half the difference between 

 the 5$ for positive and negative p, a. Writing 



.T± = 1 + 5.r± = 1 ± i ^ 



i 



2 1 ± 0- 



