24 



ART. 4. — K. HOXDA AXD T. TERADA. 



TABLE XV. 



Jr=±688^r./;//;;/.- 



(ii) 50.72 fo Nickel Steel. Figs. 11, 12, 13 and 14. 



The change of length clue to magnetization differs widely for 

 different tensions. For slighter tensions, the wire generally elon- 

 gates by magnetization, except at very weak fields, where it 

 slightly contracts, a fact not observed in j^i'evious ex2:)eriments.* 

 The amount of the elongation increases, raj^idly at first, and tends 

 soon to an asymjDtotic value, as the field is increased. The in- 

 creased tension depresses the elongation in a remarkable degree, 

 so that beyond a certain tension, the change of length by magneti- 

 zation changes its sign and becomes a contraction. The effect 

 of tension, however, decreases uniformly with the increase of the 

 tensions. The results are given in Table XVT, and graphically 

 in Figs. 11 and 12. 



*) H. Nagaoka and K. Honda, Jour. Sc. Coll. XIX. Art. 11, lOOH. 

 K. Honda and S. Shimizn, Ibid. XX. Art. G, 1905. 



