between longitudinal and circular. :\ragnetizations. 291 



2. Smaller Iron Tube. 



In llio first place, putting tlie auxiliary copper wire in tlic 

 central line of the magnetizing coil, the direct action of the 

 longitudinal current on the ma2;netometer was eliminated, and 

 then the conipensation of the magnetizing coil brought to perfec- 

 tion. Replacing the auxiliary wire by the iron tube which was 

 carefully annealed, it was magnetized longitudinally, and then 

 gradually increasing the axial current, the corresponding deflec- 

 tions of the magnetometer were noted. The strongest current 

 used in this experiment was 40 amperes. 



The following table contains o sets of the observed results ; 

 ,6 curves for different magnetizing fields are given in Fig. 8. 



TABLE II. 



Next changing the order of magnetization, tlie tube was first 

 circularly magnetized by a constant axial current, and then mag- 

 netized longitudinally, beginning with zero field up to a])Out 60 



