TORSION AND MAGNETIZATION. 



269 



Longitudinal Field being Constant. 



Nickel wire: diam. =0.83 mm. 



§2. Circular magnetization produced by twisting a 

 longitudinally magnetized wire. 



By twisting a longitudinally magnetized ferromagnetic wire, 

 circular magnetization is developed. If, therefore, two ends 

 of tlie wire are connected by a conducting w^ire, a transient 

 current due to the circular magnetization appears in the cir- 

 cuit at the moment when the twist is applied. Some years ago, 



