Elasticity of Ferromagnetic Substances by Magnetization, 47 



rather than to the impurity of the latter specimen, as it was 

 slightly annealed with a gas-flame. 



The change of elasticity calculated from the tension effect 

 on the magnetic change of length, somewhat resembles in its 

 aspect that for pure nickel, but the amount of the change is 

 much smaller. The calculated values are given in Table VI. 

 and in fig. 4 with dotted lines. 



Table VI. — AT= ^6?)$ gr./mn: " 





T=1326 gr./mm.2 



T=2600 gr. mm. 



2 



ir 



Pxl<* 



^xl0». 







E u 



E u 





10 



-2-23 



-0-90 



£0 



-207 



-1-75 





40 



-3-26 



-2-42 





70 



-119 



2-23 





100 



+0-44 









200 



+ 1-78 



4-1-75 





300 



4-2-97 







Thus 



;, m pure a 

 sensible deviation from relation (3). 



well as in commercial nickel, we find a 



Swedish Ikon and Tungsten-Steel, 

 (i.) Swedish Iron. PI. I. figs. 5 & 6. 

 The change of length due to magnetization is given in 



Table VII. and in fio\ 5. 



Table VII. 



t=9°-2 C. 



T = 1627 



gr./mm. 2 



T=241C 



gr./ium. 2 



IT = 3190 gr./mm.2 



H. 



^Xl0*. 



II. 



|xl0 l; . 



II. 



j X10 G . 



3-8 



-0-02 



3-8 



-0-09 



35 



-0-10 



SI 



4-0 94 



8-3 



4-064 



8-6 



4-042 



12-4 



4-1-44 



12-8 



4-1-00 



14- L 



4-0-66 



175 



4-1-68 



16-8 



4-1-10 



17-7 



+072 



23-3 



+ 1-78 



22-3 



4-1-18 



234 



+0-74 



35 - 3 



4-1-80 



33-8 



+ 1-18 



33-4 



4-0-68 



54-2 



4-1-60 



52*5 



4-0-98 



53-8 



4-0-44 



78-2 



fl-2fi 



74-8 



4-0-'i2 



780 



+ 004 



117-2 



4-0-56 



1133 



-008 



1136 



-0-60 



185-0 



- 0-82 



1863 



-1-54 



187-8 



-2-12 



250 



-210 



252 



-2-80 



253 



-340 



318 



-3-30 



3-20 



-3-94 



322 



-4-56 



384 



-434 



385 



-4'C3 



388 



-r-56 



