Abstract
The normal total emittance of limestone (from Linwood mines in Iowa) was measured by using the integral blackbody comparison method. The limestone sample (chem comp: CaCO 3 59%, MgCO 3 26%, Ca(OH) 2 15%) was embedded in a precisely drilled cavity in the wall of a hollow, cylindrical, electrically heated silicon carbide furnace. A small rectangular hole, whose size was equal to that of the limestone sample, served as a source of blackbody radiation. The emittance at a given temperature was obtained from the ratio of the sample and the blackbody radiation intensities. In the temperature range 711 K to 1228 K the emittance was found to decrease with temperature in a linear manner as given by ε n = 0.821 − 1.25 × 10 −4 T .
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