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Magnetised Iron, &c., cooled to Temperature of Liquid Air.
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Fig. 15.—Mond’s pure nickel.
the magnetometer, and cooling them by immersing in liquid air, it •was found that the first effect of the cooling was to produce a small diminution in the magnetic moment, and the subsequent heating in some cases produced a further diminution of magnetic moment. In the first sample of soft iron, the wire was about 3 cm. long, and bent
