36 



BELL SYSTEM TECHNICAL JOURNAL 



less variation in the iron content is permissible, being less than one 

 half of the amounts of the other two constituents. The manner in 

 which each of the metals affects the magnetic properties is not very 

 clearly indicated by the numerical values in the table. Iron and 



4000 



B 2000 



-2 



4000 

 B 2000 



52 

 6000 



4000 



B 



2000 



4000 



B 2000 



-2 



2 4 6 



H 



2 4 6 



H 



4000 



B 2000 



4000 



B 2000 



4000 

 B 2000 



?2 

 6000 



4000 

 B 



2000 



2 4 6 

 H 



-20246 



H 



2 4 6 



H 



Fig. 11 — Upper halves of hysteresis loops for several Penninvar compositions. 

 Chemical analysis is given in Table II 



cobalt appear to increase the constancy of the permeability but 

 decrease the initial permeability values. Nickel increases the initial 

 permeability but large percentages decrease the constancy. On the 

 whole, in the alloys with high nickel content, the combination of high 



