The London, Edinburgh and Dublin philosophical magazine and journal of science . tion is mnch smaller than in soft , in the case of rigidity, we also observed comparativelylittle increase. The results are given in fig. 5. We see Fio-. fe (5) (4-) i ? * (3) (2) H 0 BOO 4-00 600 800 that the form of the curves is similar to that of magnetizationin steel. Here again, the change of rigidity is independent of thetwisting couple for all magnetizing fields: the values ofSK-jr- for different fields are given in the following table and in fis:. 4 :— H ^xlO2. iv 600
The London, Edinburgh and Dublin philosophical magazine and journal of science . tion is mnch smaller than in soft , in the case of rigidity, we also observed comparativelylittle increase. The results are given in fig. 5. We see Fio-. fe (5) (4-) i ? * (3) (2) H 0 BOO 4-00 600 800 that the form of the curves is similar to that of magnetizationin steel. Here again, the change of rigidity is independent of thetwisting couple for all magnetizing fields: the values ofSK-jr- for different fields are given in the following table and in fis:. 4 :— H ^xlO2. iv The results of previous experimenters fairly agree withthose of the present case. The reciprocal relation betweentorsion and magnetization also holds for steel. 6. Wolfram Steel.—The change of elasticity in Wolframsteel due to magnetization is nearly the same as that of softiron both in quality as well as in quantity. This remark alsoapplies to the present case, so that what we have said aboutthe change of rigidity in soft iron equally applies to the case. £00 400 600 800 H of Wolfram steel, as will be seen from figs. G and 4, and thefollowing table:— H 20. 60. 1C0. 200. 400. 600. 800. 0-15 073 0-85 0-98 ?>* 1-10 1-16 1-22 544 K. Honda, S. Shimizu, and S. Kusakabe on Change of These numbers are very close to the corresponding ones insoft iron, except in weak fields, 7. Cobalt.—As in the case of steel, the effect of magneti-zation on the rigidity of a cobalt bar is very small. Therigidity always increases by magnetization, as shown infigs. 7 and 4, and the following table :— -^xlO2. 200. 400. 0-12 0-21 Figr. 7. 600. 0-28 0-5 S0 -—(61 (4) - (2) H 200 400 600 800 Thus the course of the curves is less steep in cobalt thanin iron or steel; the inflexion point is not so marked in theformer metal as in the latter. The change of rigidity is alsoindependent of the applied couple. So far as we are aware the effect of torsion on the mag-net
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