342 H. NAGAOKA. 



Taking for abscissae the strengths of the magnetizing force, and 

 for ordinates the corresponding transient currents, we get the curve 

 (Plate XXIX, Fig I, Curve I) representing the relation between the two. 



An examination of the curve will show the changes in the 

 transient current as the strengths of the field is increased. The 

 current at first increases nearly proportional to the increase of the 

 magnetizing force. On passing the field of about 3 units, the 

 increase takes place very slowly and ultimately reaches a maximum 

 for iQ= 4.5 nearly. The current then gradually decreases, though at 

 a slower rate than that at which it first increased. This rate of 

 decrease becomes still slower as the field is further increased. The 

 curve representing the relation between the transient current and the 

 strength of the magnetizing force has thus two inflexional points, the 

 one just before reaching the maximum, and the other after passing the 

 maximum. From its similarity to the analogous feature in the curve 

 of magnetization, I shall hereafter call the point at which the ratio 

 <>f the transient current to the magnetizing force is greatest the 

 'Wendepunkt' of the transient current curve. 



On increasing the angle of twisting to ±30°, and experimenting 

 on a new piece of wire taken from the same bundle and treated in the 

 same way as before, Curve II. Fig. I. was obtained. The examina- 

 tion of this curve shows the same characteristics as before. But the 

 transient current has greatly increased for all strengths of the mag- 

 netizing field, while, at the same time, tin; maximum current occurs 

 in a higher magnetizing field than in the former case. This takes 

 place for ft — 6 nearly. 



By increasing the twisting to ±60°, Curve III. was obtained. 

 The changes wrought bv this second doubling of the twisting were 

 not nearly so great as in the first doubling from 15° to 30°. The 

 general feature remaining the same as before, we notice a peculiar 



