Abstract
WHEN magnetic material is subjected to a mechanical force, its magnetization is changed; and conversely, if its magnetization is changed, the material expands or contracts. There is thus a relationship between the stress and magnetization of magnetic materials which is called magnetostriction. According to an article by M. T. Dow (Bell Lab. Rec., 22, No. 10; June 1944), noise encountered some eight years ago on certain telephone lines was found to be caused by vibrations set up by wind in a long river-crossing consisting of steel conductors, and experiments indicated clearly that the noise was due to magneto-striction. The alternating stresses in the taut wires vibrating under the influence of wind, resulted in corresponding changes in the magnetization of the steel wires, and these magnetic fluctuations induced voltages in the wires that appeared as noise at the ends of the line.
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Magneto-Striction Noise from Telephone Wires. Nature 154, 369 (1944). https://doi.org/10.1038/154369a0
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DOI: https://doi.org/10.1038/154369a0