34 



AKT. 7. — K. HONDA AND T. TERADA. 



(/>) Magnetizaiion linder constant tensions : (/, H)^^ 

 Among other ferromagnetic metals and alloys, nickel steels 

 are characterized by the extraordinary steepness of the curve of 

 magnetization ; in a field of 5 C.G.S. units, the magnetization 

 attains a value which is only a little short of its saturation 

 value. The steepness increases \Yith tension, first rapidly and then 

 gradually to an asymj^totic value. The enormous values of sus- 

 cejitibility x are given in the following table and plotted in Fig. 

 29. It will be noticed that the maximum value increases with the 

 percentage of nickel. In 70.32^ Ni., the susceptibility even attains 

 a maximum value of 1015 for 7^=4930 gr.lmnî^, which is sevenil 

 times greater than the maximum susceptibility of a well annealed 

 Swedish iron. In very weak fields, the magnetization is consider- 

 a1^ly increased by tension, but in higher fields comparatively little. 



