ON TRANSIENT ELECTRIC CURRENTS. 



343 



difference between the curves II. und III. At first the transient 

 current increases for r=±60° as the field is increased, hut until the 

 magnetizing force is about 5 C. G. S. units, the current is always 

 smaller than that for the twisting of ±30°. When 0=5, the tran- 

 sient current attains the same value for these two different twists, 

 and henceforth the current for the larger twisting acquires an ascen- 

 dency over that for the smaller. The rate of decrease after passing 

 the maximum is slower for the larger twist than for the smaller. 

 The maximum point occurs in a still higher field, namely, &=8 nearly. 



With the twist increased to ±90°, the transient current curve 

 (IV.) becomes still further transformed. What was noticed on com- 

 paring II. with III. applies equally well when we compare III. with 

 IV. The curve in weak fields lies below that for r = ±60°, but 

 when § exceeds 13, the former lies above the latter. In this case, 

 however, the maximum current is less for the larger twisting. 



From the comparison of these four curves, we may reasonably 

 infer what would be the course of the curve when the angle of 

 twisting is further increased. Evidently the transient current in 

 weak magnetizing fields as well as the amount of maximum current 

 will be smaller for high than for moderate angles of twist. After 

 passing the maximum, the slope of the curve will become less steep, 

 as the angle of twist is increased, so that the curve will necessarily 

 cut all those having a greater maximum current, and ultimately lie 

 above the corresponding branch of the curves for smaller twistings. 

 At the same time, the strength of the magnetizing field correspond- 

 ing to the maximum transient current will be increased as the twist 

 is taken greater. 



The effect of longitudinal stress on the transient current was 

 also tried. It simply produced decrease of the current as I have 

 already mentioned in my former paper. 



