A method has been described for the rapid determination of the total emissivity of metals and oxides in the temperature range 300-800° C. Values have been obtained for lampblack and polished platinum and also for Nimonic 75, pure nickel, and stainless steel, with various surface conditions. The total emissivities of the pure oxides ceria, zirconia, thoria, magnesia, alumina and fused silica have also been determined. The effect of particle size of the oxides and the variation of emissivity with angle of emission have been studied.
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Sully et al. (1952) studied this question.
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