of Steel, Nickel, Cobalt, and Nickel-Steels, 55 



the effect is reversed. The existence of a critical point in 

 cobalt, analogous to that of Villari in iron, is thus established 

 (see fig. 5). With annealed cobalt the effect is simpler. As 

 will be seen from the curves in fig. 6 the longitudinal pull 



Fiff. 5. 



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Fig. 6. 







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AKNEALLD C031LT X 



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always causes diminution of magnetization which increases 

 v, ith the field. Thus the behaviour of cast and annealed 

 cobalt stands in correlation with the chancre of length caused 



i to o 



by magnetization. 



Loading nickel-steel wires always results in the increase of 

 magnetization, as will be seen from fig. 7. The following 



Fiff. 7. 



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parallel statements will clearly show the reciprocity between 

 the change of length due to magnetization and that of 

 magnetization wrought by the mechanical stretching. 



