348 



The increase of the angle of torsion giving maximum transient 

 current with the strength : of the magnetizing force is thus apparent. 

 We see a strong analogy between the magnetizing force giving 

 maximum current when the twisting is kept constant, and the angle 

 of twisting producing maximum current when the magnetizing force 

 is kept constant ; the increase in the one produces increase in the 

 other. 



When the wire is subjected to longitudinal stress, the transient 

 current is greatly diminished, while the maximum point occurs for 

 larger twists than in the case of the unstretched wire. In § = 2.4, 

 the maximum current occurs for the twist of ±30° when the wire is 

 unleaded : when it is loaded with 4 kg. weight, it occurs at «about 

 ±36°. and when the load is increased to 8 kg., it takes place at 

 about ±42° as will be seen from the curves V. and VI. For SW ">..';, 

 the angle of torsion giving' the maximum transient current is ±.*>f) 

 when the wire is unstrained, but becomes greater than ±90° when the 

 wire is loaded with 8 kg. 



If we suppose the development of the transient current to be 

 entirely due to the aeolotropic magnetic susceptibility caused by 

 twisting the wire, the transient current in the present set of experi- 

 ments must depend upon the difference of susceptibilities along the 



