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A current is passed through a long wire, a stainless or piano wirea dark color, >then briefly glows red again; meanwhile the wire shortens,
that either sags or is tensioned with a spring. The wire grows red hot.
Then the current is cut off. The writers report that the wire cools to
Others describe the varying sag. This was (is?) offered as a changeof state latent heat, a curie point issue etc....