OX TRANSIENT ELECTRIC CURRENTS. "ß^ 



rises nearly perpendicular to the axis of ,\?. This rapid increase, 

 however, takes place only within a small range of the magnetizing 

 force. After a certain strength of field is reached, which in t lie above 

 experiment does not exceed 5 units, the curve reaches the Wende- 

 punkt. After passing this point, the curve rises very little, the 

 current remaining of nearly the same strength within a pretty large 

 range of the magnetizing field. There is, however, a maximum, as 

 will be seen by examining the readings. But as the decrease of the 

 current after as well as its increase before the maximum is reached 

 takes place very slowly, it is difficult to know the exact strength of 

 the magnetizing; force corresponding" to the maximum. The curve 

 representing the transient current is somewhat similar to the curves 

 of magnetization of twisted nickel wire, with the difference that in 

 the latter there is no maximum point. 



The examination of these curves shews that there is no great 

 variation of current with the difference of the angle of twist, so that 

 among the four curves taken with 1 mm. wire, we notice only small 

 displacement of curves for larger twistiugs. Nevertheless, the current 

 is sensibly smaller for the smaller twistings. Nothing definite can 

 he said as to any change of the magnetizing force corresponding to 

 the maximum transient current as the twist is increased. One thing, 

 however, is quite certain — the magnetizing field corresponding to the 

 maximum transient current is generally greater in nickel than in 

 iron. 



Another remarkable difference in the currents produced in iron 

 and in nickel is the oppositeness of the direction of the transient cur? 

 rent. .The direction of the current in iron is from the north to the 

 south pole when the wire is twisted right-handedly, whereas in nickel 

 il is from the south to the north pole. If we consider the current 

 as the effect of aeolotropic stress produced by twisting, the current in 



