The London, Edinburgh and Dublin philosophical magazine and journal of science . ic chloride. The result wasin the negative within the range of field used in the presentexperiment, as will be easily expected, since the pressure isproportional to the square of the field strength. (a) Cast Steel (fig. 8). The metal shows increase of volume in fields up to <£j = weak fields the change is very small, but the rate istolerably large; as the field increases the curve reaches aninflexion-point. The change goes on somewhat slowly forfields amounting to a few hundred units ; it again reachesa
The London, Edinburgh and Dublin philosophical magazine and journal of science . ic chloride. The result wasin the negative within the range of field used in the presentexperiment, as will be easily expected, since the pressure isproportional to the square of the field strength. (a) Cast Steel (fig. 8). The metal shows increase of volume in fields up to <£j = weak fields the change is very small, but the rate istolerably large; as the field increases the curve reaches aninflexion-point. The change goes on somewhat slowly forfields amounting to a few hundred units ; it again reachesan inflexion-point, whence to increase steadily and almost ata constant rate as the field is farther increased. * (b) Nickel (fig. 8). In our two former experiments we noticed a discrepancy\a the nature of the volume-change in this metal. With abar of square section we noticed a diminution, while an ovoidshowed an increase. That this may be easily accounted forwe have already discussed in our former paper, so that itwould be unnecessary to enter into the subject anew. Fig. With the present specimen, which may be considered asmore homogeneous, we noticed a slight increase of volume,which is about the same in amount as that observed in theformer experiment. The character of the change is similarto that in steel, the curve of the change presenting two 58 Prof. Nagaoka and K. Honda on Magnetostriction inflexional points. These points do not appear in such aremarkable degree as in steel, but their whereabouts can beascertained at a glance. (c) Cobalt (fig. 8). Just as we have noticed a difference in the length-changeand the intensity of magnetization in the cast and annealedmetals, we notice a difference in the volume-ohange for thesetwo bodies. The results of observation are plotted in curves(fig. 8). The behaviour of cobalt is unlike other ferromag-netic substances—instead of showing increase the magnetiza-tion causes diminution of volume, which in the annealed statebears cl
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
