ON TRANSIENT ELECTRIC CURRENTS. 



,100 



Curve VII £=9.6 (loaded 4 kg.) 

 , VIII § = 5.5 ( „ 8 „ ). 



These curves, in their chief characteristics, all resemble those 

 obtained by the application of sudden twisting. As the angle of 

 twist; is increased, the transient current due to reversal increases at 

 first very rapidly, but ultimately it reaches a maximum whence it 

 begins to decrease slowly. For strong values of the reversing Held, 

 the current is small for small twists, but as the twist increases, it 

 ultimately cuts the curves for smaller magnetizing force. Thus the 

 rate of decrease of the current for greater twists becomes smaller as 

 the field is increased. So far everything is similar to the results 

 obtained with sudden twisting. 



In the curves given in Fig. TV., we again notice the shiftino- of 

 maximum point to places of greater twist as the magnetizing force is 

 taken Greater, as will be seen from the following table. 



The twist corresponding to the maximum transient current, 

 whether that is due to reversal of held or to sudden twisting, has a 

 similar relation to the magnetizing force. As the field is increased, 

 the angle of torsion corresponding to the maximum current becomes 

 correspondingly great; but. for the same strength of the magnetizing 

 field, the twist corresponding to the maximum current when the field 

 is reversed is smaller than the twisting of the same name, which for 

 steady field «fives the maximum current. Of course the anode of 



