132 



Mr. E. L. Wills on the Efect of 



were obtained from the B — H curves and the corresponding 

 values o£ the hv 



iteresis found from fig. 8. 



Fiff. 8. 



.30000 













/I5C 



25000 







































^00'c 















/256'C 













f / / 



/315'C 



15000 











'// 











// / 



Y / / 



/,364°C 











/// 



/ /\ 



/4-l2°C 



10003 









' / / 















/ / 



4-72° C 













s^s* 



H°C 



5000 





/ 















^ 604° C 









^^^^^^^^^r648'C 







2OO0 



6000 8000 10000 



Fig. 9. 



^12500 

 £ 10000 



|.500 



1 



^ 5000 







\ 

















VA 













>& 





\ 













X 





x^ 

















^ 



JQOc * £00° 300° 400° 500° 



T£MP£ffATUfl£ , /A/ D£QffC£S C£/VT/G/?J0£. 



600 



700' 



Two of these curves for H = 5"98 and 7*97 c.G.s. respec- 

 tively are shown in fig. 10. It will be seen that throughout 

 a considerable range of induction the hysteresis is a linear 



