10 ART. 4. — K. HONDA AIN^D T. TERADA, 



and the same procedure repeated. The compensation was always 

 readjusted for different initial weight. 



Our object was partly to test the validity of equation (3), 

 and since tlie change of elasticity was considerably affected by 

 tension, the initial and the additional tensions were so chosen as 

 to exactly correspond to those in the experiments of the mag- 

 netic change of length under constant tension. 



In the calculation of the percentage change of elasticity due 

 to magnetization, the values of elasticity were taken from the 

 results of our experiments specially undertaken for this purpose. 



The specimens tested and their dimensions were as follows : — 



The experimental results are given in the following pages. 



NICKEL 



(i) Pure Nickel. Figs. 1 and 2. 



"NT 



The change of length -p by magnetization for different 

 tensions T and external magnetic fields H are given in the 

 following table and Fig. 1. 



