272 



H. NAGAOKA AND K. HONDA : 



of the wire uniform. Thus maintaining the electric current 

 in the wire constant, it vvas twisted and the induced current 

 in the secondary circuit due to the longitudinal magnetization 

 thereby developed was measured by the ballistic method. 



Some of the results of observations are given in the follow- 

 ing table and graphically shown in Fig. 5. 



C denotes the total current through the wire expressed in 

 amperes ; and Q, have the same meanings as before. 



As will be seen from the figure, the quantity of induced 

 electricity in the secondary circuit, and therefore the longi- 

 tudinal magnetization developed, by twisting a circularly mag- 

 netized iron wire attains a maxinnim, when the mean circular 

 field is about 10 units. It then decreases, but in s})ite of the 



