16 



A HT. 



-K. HONDA AXD T. TEPvADA, 



and slightly increases the magnetization. Tn Swedish iron, the 

 cyclic eftect of twisting (Fig. D) under low tensions is always to 

 diminish magnetization. In high tensions (Fig. 11), the eifect has 

 a singular character : for a small twist, the magnetization increases, 

 bnt for a large twist, it is diminished. In tungsten steel, the 

 cyclic effect of twist is similar to the C3'clic eftect of tension in 

 Swedish iron, but in amount it is very small. Curves {ol;, H)r,r 

 as deduced from ('^/,, -)H/r are given in Figs, lo, 14 and 15 in 

 full lines. They greatly resemble those for the tension effect, 

 having i)oints corresponding to the Villari points. With consi- 

 derable twist, (''^c, t^)-,T (Figs, lo and 14) is always negative. 

 The experimental numbers are given in the table below : — 



SWEDISH IRON. 



T= 1 5 2 gr.lniinr ; /= 1 5 .°6 T. 



