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THE change of magnetic susceptibility during allotropic transformation or melting of metals was first observed by one of the present writers1 about twenty-five years ago, in his measurement
of the magnetic susceptibility of pure metals at temperatures ranging from room temperature up to 1,000°. In that paper the remarkable fact was mentioned that the magnetic susceptibility of
tin changes its sign twice as the temperature rises. That is, the change of grey tin, which is a strongly diamagnetic substance, into white tin at 18°, is accompanied by an abrupt increase
of susceptibility, which becomes thus paramagnetic, and afterwards this susceptibility remains constant up to 232°, at which temperature it resumes its diamagnetic properties on melting. In
order to obtain a more accurate value of the susceptibility change during allotropic transformation or melting, we have recently measured the susceptibility in vacuum, and have succeeded in
explaining the phenomenon in a quantitative way by applying our former theory2 which has been proposed to explain the chango of susceptibility in metals caused by cold working.
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