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Published online by Cambridge University Press: 15 September 2014
It has been pointed out by several experimenters, notably by Ewing, and Gray and Ross, that a specimen of steel freshly annealed is in a peculiar magnetic condition. Thus, if a specimen, thoroughly demagnetised, is annealed and then tested, a certain I–H curve is obtained. If it be then demagnetised, and tested again, a second I–H curve is obtained which lies definitely below the first; and any further tests after demagnetisation produce a repetition of the second curve, which is characteristic of the specimen. To obtain the first curve again, the specimen has to be annealed from the same temperature as before, and a test made before demagnetisation.
page 243 note * Ewing, J. A., “Experimental Researches in Magnetism,” Trans. Roy. Soc., clxxvi. p. 630.Google Scholar
page 243 note † Proc. Roy. Soc. Edin., xxviii, pp. 239 and 615 (1908).
page 243 note ‡ Trans. Roy. Soc., clxxvi. p. 580 et seq.
page 244 note * Proc. Roy. Soc. Edin., vol. xxix. p. 182, 1909.
page 244 note † Proc. Roy. Phil. Soc. Glasg., vol. xii., 1910.
