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We report measurements of the temperature T dependence of the linear polarization 〈P〉 of the thermal radiation emitted by thin, incandescent tungsten wires in a range from a little above room temperature up to melting Tm ≈ 3700 K across the visible and infrared range. These are the first measurements in such wide a temperature range. We found that 〈P〉 decreases with increasing T. The theoretical prediction...
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