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A semi-absolute method for thermal conductivity measurements on solids near room temperature is described. Heat from a heat source flows through a sample of uniform cross section to a heat sink which transfers this heat by thermal radiation to the surrounding chamber walls. The temperature T 0 of the chamber walls and the temperature T 1 of the heat source are kept at constant levels with T 1 > T 0 . At temperature steady state the measurement of T 0 , T 1 and T x (heat sink) allows the calculation of the thermal conductivity if the emissivity of the heat sink is known. The emissivity is determined with standardized specimens. Details of an apparatus utilizing the described method are given. The method is accurate to 3-5%, even for samples with a side as small as 2-3 mm.
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Haacke et al. (1965) studied this question.
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