138 



Dr. S. W. Richardson on the Magnetic 



sudden change in the permeability of the alloy. This steep part 

 of the curve is followed by a very flat part extending over 

 about 100°, for which range of temperature the permeability 



Fig. 11. 

 1000 



900 

 800 

 700 

 600 

 500 

 400 

 300 

 200 

 100 









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j 



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B 





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H= 



1-96 



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100 eOO 300 400 500 600 700 800 900 1000 

 Fig. 12. 

 1000 



900 

 800 

 700 

 600 



500 

 400 

 300 

 200 



100 





 0-0 1-0 2-0 3-0 40 5-0 6-0, 7-0 8-0 9-0 10-0 11-0 12-0 



remains almost constant. This flat part is followed by a 

 steep part extending to about 600°, when the curve begins to 

 bend round again, finally becoming parallel to the axis of 

 temperature at about 750° C. 



This temperature was taken as the critical temperature for 

 the ring of alloy. 









































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