CHANGE OF ELASTIC CONSTANTS OF FERROMAGNETrCS. 



41 



Swedish Iron and Tungsten Steel. Figs. 30 and 31, 



TABLE XXVI. 



SWEDISH IRON ; 



A'o = o./S6x lo'-. /'=I4°.6 C. 



TUNGSTEN STEEL ; 



Ko — o.6oSx lo'-. /= i4°.o C. 



Tiie rigidity of Swedish iron slightly decreases in weak fields, 

 but generally increases by magnetization. The amount of in- 

 crease becomes greater and then slowly decreases with the field. 

 The change of rigidity of tungsten steel is very small ; it slightly 

 decreases at first, and then steadily increases with the field. Both 

 of these specimens are characterised by the smallness of the change 

 of rigidity as well as that of elasticity. By a similar method, 

 H. Tomlinson''' found that for a moderate field, the change of 

 rigidity of an annealed iron wire is insensibly small. 



* H. Toralinson, loc. cit. 



