. Carnegie Institution of Washington publication. 94 INFRA-RED REFLECTION SPECTRA. CARBORUNDUM (SiuciuM CARBIDE) (SiC). (Large hexagonal plate, naturally highly polished. Curve a, fig. 81.) This is an artificial product obtained from a carborundum furnace. The reflection curve is the most remarkable one yet discovered. The selective reflection bands of quartz at to ^ stand second in the order of intensity. Since absorption, reflection, and refraction are intimately connected, the reflection curve gives us an idea, qualitatively, of the dispersion of this mineral. It will be noticed th
. Carnegie Institution of Washington publication. 94 INFRA-RED REFLECTION SPECTRA. CARBORUNDUM (SiuciuM CARBIDE) (SiC). (Large hexagonal plate, naturally highly polished. Curve a, fig. 81.) This is an artificial product obtained from a carborundum furnace. The reflection curve is the most remarkable one yet discovered. The selective reflection bands of quartz at to ^ stand second in the order of intensity. Since absorption, reflection, and refraction are intimately connected, the reflection curve gives us an idea, qualitatively, of the dispersion of this mineral. It will be noticed that the reflection curve drops abruptly from a fairly constant value at 9 p, to a very low value at 10 /x, while beyond 13 /j. it remains abnormally high. This is exactly what is found for the refraction curve, in the region of anomalous dispersion, and to illustrate this point the carborundum curve is the best example yet observed. In this connection it will be noticed the reflection curve of quartz decreases more uniformly throughout this whole FIG. 81.—Carborundum (a) ; Sulphur (b]; Graphite (e). GRAPHITE (C). (Natural mineral from Siberia. Curve c, fig. 81.) The reflecting power of various forms of carbon, such as "gas- carbon" and anthracite, have been examined by Aschkinass,1 who found the reflection to increase from 30 per cent at 8 p. to 53 per cent at 26 ft for the former, and a uniform reflection of about 13 per cent throughout this same region for the latter. Aschkinass: Ann. der Phys. (4), 18, p. 373, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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