Elasticity of Ferromagnetic Substance* hy Magnetization. 49 



Thus 



SE 

 E 



is as a whole verv small, and increases with the 



,. SE 



field tending to an asymptotic value. 



On the other hand, the calculated values of -,V from the 



E 



magnetic elongation are decidedly greater than those obtained 



by our direct method, as may be seen from Table IX. and 



fig. G in dotted lines. The difference is remarkable as well 



as interesting. 



Table IX. 



AT =±781 gr./mm. 2 





T= 1627 gr./mm. 3 



T=--3190gr. mm. 2 



T = 4754 gr./mm. 2 



H. 



Jlxm 



^XlO 2 . 



°~ E X 10 2 . 





*n 



E n 



E n 



10 



9 



0-6 



0-4 



20 



1-4 



0-8 



05 



40 



1-6 



0-9 



0-8 



70 



1-7 



10 



0-9 



1 00 



1-7 



11 



0-8 



200 



1-7 



11 



OS 



300 



14 



11 



0-8 



350 



1-4 



1-0 



0-8 



(ii.) Tungsten- Steel. PI. I. figs. 7 & 8. 

 The elongation by magnetization increases at first rapidly, 

 then slowly, and afterwards gradually decreases. Tension 

 decreases elongation regularly. The results are tabulated as 

 follows : — 



Table X. 



t=12°-5 C. 



T=1693 gr./mm. 2 



T = 2509 



gr./mm. 2 



T=3322 gr./mm. 2 



H. ^xlO 6 . 



H. 



- 003 



H. 



; xio G . 



10-0 0-03 



9 



9-5 



0-04 



13-8 0-09 



131 



0-08 



13-5 



0-09 



19 4 0-60 



19-5 



0-64 



19-5 



0-57 



24-9 1-39 



252 



- 1-46 



25-2 



1-32 



422 2-72 



42-8 



2-62 



42-7 



239 



64-5 3-26 



655 



34 6 



64-9 



2-88 



96 2 3-56 



97-4 



3 48 



970 



3-15 



1672 372 



168-8 



3-60 



1680 



324 



246 363 



24(5 



3-48 



245 



3-13 



330 3-48 



333 



326 



331 2-92 



399 3-28 



402 



311 



400 



2-78 



Phil. Mag. !3. 6. Vol. 13. No. 73. Jan. 1907, 



E 



