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60
Profs. J. Dewar and J. A. Fleming. Changes produced in
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slowly. In this case, however, the first diminution of magnetic moment was still greater. On first immersion in the liquid air the magnet lost about 33 per cent, of its moment. On allowing if to heat up again to 5° C. it still further diminished in moment, and from and after that point it arrived soon at a permanent condition, in which its moment, when cold, was greater than its moment when warm by 30 per cent, of its moment at 5° C. These
