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The theory of the heat losses from an electrically heated wire, as given by Roberts and Kannuluik, has been extended to include a wire supported by springs. The results obtained have been used in a measurement of the thermal conductivity of commercial tungsten wire in the temperature range from 78°K to 273°K. There are definite indications that the Wiedemann-Franz law breaks down badly in this region.
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Michels et al. (1936) studied this question.
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