466 K. Honda, S. Shimizu, and S. Kusakabe on Change of 



initial decrease is not observed. Some of the values of -^ 

 are given in the following table : — 



h/t-kw . 



1251 gr. 



2184 gr. 



3096 gr. 



50 



0-14 Xl0" 2 



0-15 X 10 ~ 2 



0-17 xl0~ 2 



100 



0-22 



0-25 



025 



200 



027 



0-33 



031 



300 



0-28 



037 



035 



400 



030 



0-40 



039 



This steel bar shows a comparatively small increase of 



elasticity. With the present specimen, the value of -„- 



under a given field reaches a maximum with a load lying 

 between 1270 and 2200 grams. 



6. Wolfram Steel. — The change of depression for Wolfram 

 steel bar by magnetization is similar to that for soft iron, as 

 shown in fig. 6. It is still greater, and the curve does not 



Fiar. 6. 



918 7/ 



tend to become asymptotic. The initial decrease of elasticity 

 is more marked in the metal than in soft iron and occurs 

 even with the smallest load. 



values of -^- for different fields and loadings : 



The following table contains the 



h/t+iw. 



358 gr. 



797 gr. 



i 



1378 gr. 



2206 gr. 

 1-56 xlO" 2 



70 



1-79 xl0~ 2 



1-88 xlO -2 



T67 XlO" 2 



100 



2-05 



2-02 



1-79 



1-64 



200 



2-55 



2-27 



2-00 



1-80 



300 



293 



2*42 



2-10 



1-89 



400 



3-26 



2-eo 



2-18 



1-92 



500 



354 



2-68 



2-23 



1-97 



