442 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1957 



60 



40 



CO 20 



ui 



_l 



o 



>- 



o 



< 



o 



uJ 



2 



+1 



< -20 



-40 



1.6 



1.2 



0.8 



0.4 



+1 



-0.4 



■0.d 



-1.2 



I 



I 



1000 



2000 



3000 



4000 



5000 



6000 



7000 



H .APPLIED FIELD IN OERSTEDS 



Fig. 6 — Evaluation of x'm ± k' from measurements of frequency shift Aa>± and 

 comparison with Polder's theory. Low-loss BTL ferrite, saturation magnetization 

 1300 oersted. 



