ON TRANSIENT ELECTRIC CURRENTS. 



373 



( lurve I. for r 



OCT 



II. 



r = ±360 c 



„ III. „ r = ± 60° (loaded 4 kg.) 



„ IV. „ r = ± 60° ( ., 8 kg.) 

 The principal features of all these carves are nearly the same in 

 all cases, and resemble those for iron. The first application of the 

 magnetizing force makes the current increase very rapidly. This 

 increase, however, takes place only within a small range of the mag- 

 netizing force. The curve soon reaches the Wendepunkt, and there- 

 after goes on rising; very slowlv. In the first two curves in Fig. XT. 

 the magnetizing force was not sufficient to make the current reach 

 its maximum value. In the third experiment for r = ±180°, stronger 

 magnetizing forces were applied, and then the existence of the max- 

 imum was demonstrated. The following are the readings. 



As was remarked before for iron wires, the maximum transient 

 current produced by reversing the direction of the magnetizing force 

 occurs for higher vaines of the magnetizing force than is the case 

 when the wire is suddenly twisted in a steady field. The comparison 



