430 Mr. F. H. Pitcher on Effects of Temperature and 



ends of the specimen. The corresponding value of the average 

 resultant permeability was taken from the full-line curves 



(fig- i). 



Effect of Circular Magnetization (fig. 3). 



Before obtaining the second set (b) of average resultant I 

 and H curves with which the above were compared, it was 

 necessary to eliminate the effect of temperature. This was 

 done by taking the drop between any two points on the dotted 

 and full-line curves (fig. 1) which are at the same tempe- 

 rature as due to circular magnetization, an assumption which 

 is very nearly correct, especially in the higher fields. 



In this way the family of curves in fig. 3 was obtained. 



/sect 



•X soc 



r 



>4 



Effect of Circular Field at Constant Temperature 18° C. on the 

 I-H Curves of Longitudinal Magnetization. 



The ordinates are longitudinal magnetization,, and the abscissae 

 longitudinal field. The curves in the lower part of the figure 

 are the continuation in higher fields of those above. They 

 are plotted to the same scale of I, but the H scale is reduced 



