158 



H. NAGAOKA. 



These readings are plotted in Fig. V. The general appearance 

 of the curve remains the same as was already noticed, hut there is 

 gradual transformation of the curve as the thickness of the wire 

 increases. The transient current produced in wires of different thick- 

 ness varies with the strength of the magnetizing force. Jn every 

 case, there is an increase of the transient current when the magnetiz- 

 ing force is first increased. The current, however, attains a max- 

 imum, and then begins to diminish slowly as in the case of the wire 1.^4 

 mm. thick. With thick wires, the current increases very slowly in 

 weak magnetizing fields, so that the curves for thick wires intersect 

 those for the thin. This effect is very well marked in the thickest wire 

 used. Curve IV . lies below all the. rest of the curve so long as the 



