ON TRANSIENT ELECTRIC CURRENTS. 383 



of reversal than by sudden twisting. 

 8. — When the thickness of the wire is altered, the initial rise of the 

 current with the increase of the magnetizing force is greater as 

 the wire becomes thinner, but the maximum current and the 

 magnetizing force giving the maximum current both increase with 

 I lie thickness of the wire. 

 9. — When the twist is varied in a constant magnetizing 1 held, the 

 maximum point occurs for smaller twists as the thickness of the 

 wire is increased. 



10. — Everything with regard to the transient current in steel is 

 similar to that in iron, with the exception, that the current is small- 

 er, and-the magnetizing force corresponding to the maximum current 

 is stronger, than those observed in iron wires of the same thickness. 



11. — The transient current produced by twisting nickel wire, or by 

 reversing the direction of the magnetizing force is opposite in direc- 

 tion to that in iron. The wire being twisted into ;i right-handed 

 screw, the current in nickel flows from the south to the north pole. 



12. — The transient current produced by twisting, or by reversing the 

 direction of the magnetizing force while the wire is held twisted, 

 soon arrives at a Wendepunkt, beyond which the increase takes 

 place very slowly, and ultimately attains a maximum. The 

 decrease with further increase of the mao-netizino- force is very slow. 

 The Wendepunkt, for the same angle of torsion, conies sooner by 

 sudden twisting than by the method of reversal. 



13. — The current in weak fields is smaller when the wire is loaded, 

 but in strong fields the curve of transient current passes above that 

 for the unloaded. 



14. — With the magnetizing force constant, and the amount of twist 

 variable, the transient current produced by sudden twisting always 

 increases as the twisting is increased. The increase, however, takes 



