8 ART. 7. — K. HOXPA AND T. TERADA. 



consequent deflection of the galvanometer was nearly the same as 

 the sum of the deflections obtained by the application of tension 

 in successive steps. 



Another series of experiments is possible in this direction. 

 The sj^ecimen was demagnetized with the smallest initial tension ; 

 it was then magnetized, and then the deflection of the galvano- 

 meter due to an additional weight was observed. After several 

 alternate additions and removals of the additional weight, the 

 changes of magnetization due to the addition and removal were 

 observed. Then the demagnetization with the initial and added 

 weights was effected, and the change of magnetization due to a 

 second additional weight was measured, and so on. 



Next the magnetization under constant tension was deter- 

 mined. The specimen was first thoroughly demagnetized by rever- 

 sals, loaded with the empty pan only. A series of successively 

 increasing fields was applied step by step, and the throw of the 

 galvanometer corresponding to each increment of the field was 

 recorded. Demagnetization was again effected, after the specimen 

 had been loaded with an additional tension, and the magnetization 

 tested in the same way ; and so on. In this way, the magneti- 

 zation under different constant tensions was obtained. 



The procedure in the experiments on the eflect of torsion 

 was similar. The torsion was increased step b}'^ step under a 

 constant field and the change of magnetization corresponding to 

 each step was observed. The eflect of cyclic twist was also in- 

 vestigated. The effect of the maximum twist applied at once does 

 not differ from the sum of the deflections obtained by a graduated 

 applications of twists, as in the case of tension. The magnetiza- 

 tion under constant torsions was next measured. These sets of 

 experiments were repeated for several tensions nearly equal to 



