Page:Proceedings of the Royal Society of London Vol 60.djvu/103

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Table III.—Hysteresis Loss in Soft Annealed Swedish Iron in Watts per pound per 100 cycles per second for various maximum Inductions.

I. A t +15° C. k____ II. A t —185° C. (in liquid air) r M aximum Hysteresis l Maximum Hysteresis induction. loss. induction. loss. B. W. B. W. 844 0-0397 688 0-02519 4026 0-4957 3603 0-4246 6743 1-062 6185 0-949 9687 2-070 9461 1-907 11618 2-632 11916 2-658 8593 1-545 5516 0-823

were taken at ordinary temperatures are denoted by the small circles. The observations for hysteresis loss which were taken at the temperature of liquid air are denoted by the crosses. It will be seen that substantially the circles and the crosses lie on the same curve. The results of these observations, therefore, show that there is practically no change in the hysteresis loss in soft iron by cooling it to the tern