368 



H. NAGAOKA. 



until the wire was .subjected to many back and fore twistings. The 

 following table gives the reading of the swing of the ballistic galvano- 

 meter magnet, obtained by twisting the wire 1 mm. thick and 27 

 cm. long, through different angles, while the magnetizing force was 

 made to vary. 



These readings express the quantity of transient current in the 

 same scale unit as used formerly in similar experiments with the iron 

 wire of 0.62 mm. radius. These readings are plotted against the 

 corresponding magnetizing force in Plate XXX. Fig. IX. Curves I.. 

 IL, III., IV. Two dotted curves V. and VI. were obtained from 

 experiments made on thin nickel. 



The above table shows that the rate of increase of the current 

 when the magnetizing force is first applied is enormous. The curve 



