10 



ART. 13.— K. HOXDA, S. SHIMIZU AND S. KU8AKAHE 



These numbers are graphically sliown in Fiu'. i. We see tlmt 

 the form of the curves is much less steep tluiii in those for soft iron 

 or wolfram steel. 



Here again, tlie change of rigidity is independent of the applied 

 couple; the values of —,.- for ditt'erent fields are given in the fol- 

 lowinii' table and in Fi"-. 2 : — 



The results of the previous experimenters fairly agree with those 

 of the present case. The reciprocal relation between torsion and 

 magnetism also holds for steel. 



Cobalt. As in the case of steel, the effect of magnetization upon 

 the rigidity (^f a cobalt bar is very small. The rigidity always 

 increases by magnetization, as shown in the following tables and 

 Fiofs. 5 and 2 : — 



H 



100 



200 



400 



600 



800 



ovr 



0.0005 



0.0012 



0.0021 



0.0028 



0.0031 



