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An instrument is described for investigations of the reflectivity, transmissivity and emission of various materials over the spectral range 20 to 150{μ}. The following measurements are reported: Reflectivities of rough surfaces, galena, β-magnesia, zincite, stibinite, corundum, sphalerite, molybdenite and cuprite. Transmissivities of KBr, KI a layer of KCl evaporated on a lacquer film, a thin film of amorphous quartz, liquid CCl₄, and powdered Al and Cu. Emission of liquid and solid NaCl near the melting temperature.
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John Strong (1931) studied this question.
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