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Measurements of magnetostriction and permeability of samples of hot-and cold-rolled silicon steels are given before and after abrasion in different directions relative to the applied field. It is shown that surface abrasion of electrical sheet steel produces high internal strains of a markedly directional nature which affect the magnetic properties. The results are interpreted in terms of the domain theory of ferromagnetism.
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R.G. Martindale (1948) studied this question.
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