Abstract
IN his experiments on the change of length by magnetisation, Joule (“Papers,” vol. i. p. 50) mentions that “the expansion, though very minute, is indeed so very rapid that it may be felt by the touch.” If everybody were endowed with such an acute sense of touch as to discriminate an elongation of a micron, it would be superfluous to think out any arrangement which would serve to demonstrate the minute change of length due to magnetisation. Since the elongation generally amounts to a few millionths of the total length of the magnetised wire, it is necessary to have an intricate apparatus in order to show that the ferromagnetic wire changes its length by magnetisation. The demonstration of magnetostriction to a large audience is thus a matter of no small difficulty.
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NAGAOKA, H. Demonstration of Magnetostriction by Means of Capillary Ripples. Nature 69, 487–488 (1904). https://doi.org/10.1038/069487b0
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DOI: https://doi.org/10.1038/069487b0
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