376 



H. NAG A OKA. 



On the first application of twist, the transient current increases 

 with the angle of twist, but it soon reaches the Wendepunkt and very 

 quickly thereafter a maximum. The curve then dips, and the 

 decrease of current with the increase of twist takes place nearly 

 proportional to each other, so that the curve appears to be nearly 

 straight. But there is another point of inflexion (not shown in the 

 figure, but evident from the readings). Thence the curve dips very 

 slowdy, and ultimately becomes asymptotic to the line of no transient 

 current. The current is very small when the twist is large, but from 

 the course of the curve it is evident that further twistings will not 

 reverse the direction of the current. 



The curve undergoes great deformation when the wire is sub- 

 jected to longitudinal stress, especially when the magnetizing force is 

 weak. The initial rise of the current takes place in the same way as 

 represented by curves obtained with unstrained wires. The curve 



