Effect of Stress on Magnetization. 85 



T = 6286 gr./mm. 2 : *=13°'7 C. 



-= 



0. 



r = ll '8. 



r=34'-6. 



r=69'-0. 



H. 



I. 



H. 



I. 



EL 



I. 



H. 



I. 



1-46 



5-6 



117 



3"8 



1-39 



4-0 



0-88 



2-6 



3-03 



11-7 



253 



8-4 



3-12 



114 



3-14 



25-5 



5-04 



•21-9 



4-26 



160 



4-89 



217 



540 



158-4 



8-92 



43-1 



9-89 



43-9 



7-80 



58-8 



8-16 



211-9 



14-29 



72-3 



15-35 



74-3 



11-58 



119-7 



1327 



2320 



23-67 



114-8 



23-86 



119-5 



23 35 



175-9 



2377 



260-3 



34-77 



156-8 



3493 



162-2 



34-98 



211-0 



35-36 



255-7 



57-33 



2297 



56'8 



234-7 



562 



265-9 



56 - 58 



325-7 



98-6 



341-0 



88-8 



321-6 



88-1 



338-5 



88-1 



372-5 



161-7 



4290 



134-3 



396-3 



147-6 



412-3 



147-3 



427 6 



195-5 



451-2 



1904 



441-9 



196-3 



444-6 



196-2 



4452 



2727 



478'7 



270-2 



471-5 



2675 



4714 



267-5 



451-3 



331-7 



465-7 



350-5 



489-8 



375-4 



491-3 



373-0 



503-8 



It is to be noticed that in nickel, the initial and the cyclic 



effects of tension or twist on magnetization nearly coincide 



with each other except in weak fields, and that the change 



of magnetization does not mnch depend on the order of 



magnetizing and straining. Thus, in nickel, the hysteresis 



effect is comparatively small except in weak fields ; and 



therefore the agreement between the theory regarding 



i • • i 



magnetostriction and the experiment might well have been 



expected. Thus, in our previous investigation, we found that 



the changes of the modulus of elasticity by magnetization for 



different orders of magnetizing and straining fairly coincided 



with each other, while in the case of rigidity, the difference 



was somewhat greater. In the present investigation also, the 



tension effect shows a better agreement for different orders 



of magnetizing and straining than for the torsion effect. 



III. Nickel-Steels containing 28*71. 50" 72. 

 70*32 per cent, of Nickel. 



As for nickel-steels, experiments on the effect of stress on 

 magnetization have been very few. So far as we know, the 

 effect of tension only was studied by H. Tomlinson * with 



* Tomlinson, Proc. Rot. Soc. lvi. p. 103 (1894) ; Beibl xviii. p. 9-52. 



