126 Mr. R. L. Wills on the Effect of 



hysteresis at different temperatures show that as the critical 

 temperature is approached the hysteresis falls very rapidly. 



Fig. 3. 



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 ^2000 



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K4000 

 I 



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 8 



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402° 



460* 

 550° 

 620° 



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4000 6000 



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300" 400" 500° 



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 Critical 



The corresponding curves which I obtained for maximum 

 inductions of ± 6000 and +4000 are given in fig. 4. An 

 induction of 6000 could not be obtained when the tempera- 

 ture had risen above about 750° C, but an induction of 4000 



