48 



ART. 4. — K. HONDA AND T. TEEADA. 



Swedish Iron and Tungsten Steel. Figs, 36 and 37. 



TABLE XXIX. 



SWEDISH IRON. 



T= 327 1 gy-lmnir t— 20°. o C. 



' = 2.5' 



' = 5.0^ 



TUNGSTEN STEEL. 



T^^a^osgr-lnun.- /=20°.i C. 



TliLis the rigidity of these metals always increases with the 

 field ; the change for Swedish iron is tolerably large ; bnt, for 

 tungsten steel, it is very small. As to the effect of amplitude of 

 twist, it is slightly to diminish the change in Swedish iron, but 

 is almost insensible in tungsten steel. The change of rigidity 

 obtained by Barus's method, is several times greater than that by 

 the oscillation method. Thus, in the case of ferromagnetic metals, 

 relation (3) does not hold even aj^proximately. 



