MAGNETIZATION AND MAGNETIC CHANGE OF LENGTH. 63 



critical temperature of the alloy to the ordinary temperature. 

 Owing to some changes occuring in the molecular configuration 

 during the process of fusion of the constituent metals, the critical 

 temperature of the alloy in the descending branch of the tem- 

 perature-cycle falls to a low temperature, and therefore the alloy 

 behaves as a weakly magnetic or non-magnetic alloy at ordinary 

 temperature. The same remark will also apply to a non-magnetic 

 alloy which consists of a magnetic metal and a non-magnetic ones. 

 The above view is also favored by the fact that in irreversible 

 alloys, the hysteresis-loss at ordinary temperature is markedly 

 small, which corresponds to the hysteresis of iron or nickel at 

 high temperatures, but its value at a low temperature considerably 

 increases, corresponding to the hysteresis of the same metal at 

 ordinary temperature. 



