306 K. HONDA : ON THE MUTUAL INFLUENCE 



when the resultant field is less than that corresponding to the 

 maximum susceptibility of iron, and that it must decrease, 

 when tlie former field is greater tlian the laUer. 



Proceeding from a similar idea as Hchultze, T Ijclieve that 

 all the phenomena observed in the present experiment can be 

 explained in the following manner. 



Suppose the ferromagnetics to be isotropic, and to iiave no 

 residual magnetism ; then the intensit}^ of magnetization at any 

 point can be expressed in the form 



where H is the resultant field. Taking H for the abscissae and 

 I for the ordinates, the curve T=/(H) represents that of mag- 

 netization. 



Now let there be magnetizing forces / and i acting in per- 

 pendicular directions, then if H= v//- + ^-, we have 



the component of which along / is 



*=Icos(H,/)=/(vzqT2) :7|i^2; 



hence if /-; l)e the susceptibility, we have 



'=1-1. 



If we suppose that / is kept constant and i is changed, 

 d~t dt 9H dt~ H" W 



