ON TRANSIENT ELECTRIC CURRENT«. 



357 



wire been in the form of a thin tube, it would be easy to see how the 

 change in the transient current takes place when the diameter is made 

 to vary. Inside the cylindrical wire, the strain is different in dif- 

 ferent places, and it is not at all easy to see how the transient current 

 will be altered with the thickness of the wire. 



To find how this alteration takes place, wires of different thick- 

 ness were examined by the method of reversal. These wires were 

 0.88 mm.. 1.24 mm., 1.54 mm., and 2.00 mm. thick respectively. 

 In each case the wire was twisted through 60° in either direction, 

 and the transient current produced in these different specimens by 

 reversing the direction of the magnetizing force was measured. The 

 following table gives the readings.* 



In subsequent expérimenta, one scale division corresponds to 2.1 x 10 u Coulomb. 



