for 'measuring Hyst 



erests. 



367 



the rod it is necessary to know the leakage coefficient of the 

 joke, or the ratio of the induction in the rod to that in the 

 yoke. A test of the leakage coefficient for different induc- 

 tions is shown in fig. 2. 



3 



For observing its induction, a coil of fine wire was wound 

 closely around the rod and the ends brought out and connected 

 with a three-way switch, so that the induction for the same 

 magnetizing current could be successively observed in the rod 

 and in the yoke. 



