360 



H. XAGAOKA. 



The curves plotted in Fig. VI. bave the saine appearance as those 

 obtained in similar experiments, by the method of reversal, with 

 wires of the same thickness. For small angles of twist, the current 

 increases very rapidly, hut as the twist is further increased, the 

 current attains its maximum value whence it begins to decrease 

 slowly. Examining each curve separately we see that the transient 

 current does not increase in simple proportion to the thickness of the 

 wire. On the contrary, the curves obtained for the wire r = 1.00 

 cuts that for r — 0.77 when the twist exceeds 40°. But it follows by 

 no means that the transient current for the thick wire cannot attain 

 still higher values. Looking at Fig. V, we see that § = 19.7 is a little 

 above the point where the curve for r— 1.00 crosses the curve for 



