20 



ART. G. K. HONDA AND S. SHIMIZU. 



The applicable limit of Steinmetz's formula becomes greatly ex- 

 tended. Thus we may say, as in the case of the pure metals, 

 that the cooling in liquid air hardens the specimens magnetically. 

 As regards the residual magnetism, the cooling considerably 

 increases it. 



(e) Length Change of Ferromagnetic IVIetals. 



Table V and Fig. 3 a, b give the observed changes of length 

 at the temperatures of room and of liquid air. Here -y- denotes 

 the elongation per unit of length. 



TABLE V. 



SWEDISH IRON. 



