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Magnetised Iron, &c., cooled to Temperature of Liquid Air.
71
300° C., the moment increased, but not to the same maximum as before, and on repeating the cycle of temperature from about 15c C. to 300c C., the magnetic moment gradually varied, in the manner shown in fig. 20, and the temperature of maximum magnetic moment
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Temperature in Degrees Centigrade.
gradually shifted upwards to about 56° C. This magnet is, therefore, an interesting case of a sample of steel which, when magnetised, has a maximum magnetic moment at a certain temperature.