<報文>石炭化度に關する研究(第1報) : 光學的研究法について

概要

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Two samples of coals of different degrees of coalification, e.g., Nagakura raw nut coal and Yubari special nut coal, were studied by means of phase-contrast microscopy, multiple-beam interferometry, and photoelectric spectrophotometry. (1) Minute differences in level and appreciable differences in hardness of constituents of polished coals were revealed under the phase-contrast microscope. (2) The microstructures of polished coals were shown by characteristic interferograms. (3) The reflectance of powders and the transmittance of benzene extracts of coals were measured and their chromaticities were specified in terms of dominant wavelength, purity, and luminance after C.I.E. system. Their chromaticity differences were specified in terms of conjunctive wavelength and purity with respect to each other.
東北大学の論文
1956-07-31