. Carnegie Institution of Washington publication. 66 INFRA-RED TRANSMISSION SPECTRA. In fig. 53, curve a, is shown the transmission curve or ordinary soft glass which has been blown into a bulb of such a thickness that it showed interference colors. This is the thinnest film yet examined. There is one large complex absorption (reflection) band extending from to p., the maximum being at p. ALBITE (NaAlSi8O8). (/ = Curve b, fig. 53-) This mineral is more transparent than orthoclase (fig. 51, curve a). The absorption bands at , , and fi coincide with those of ortho- c
. Carnegie Institution of Washington publication. 66 INFRA-RED TRANSMISSION SPECTRA. In fig. 53, curve a, is shown the transmission curve or ordinary soft glass which has been blown into a bulb of such a thickness that it showed interference colors. This is the thinnest film yet examined. There is one large complex absorption (reflection) band extending from to p., the maximum being at p. ALBITE (NaAlSi8O8). (/ = Curve b, fig. 53-) This mineral is more transparent than orthoclase (fig. 51, curve a). The absorption bands at , , and fi coincide with those of ortho- clase. ENSTATITE (MgSiO8). ("; t = i mm. Curve c, fig. 53.) This specimen was a mixture of several crystals. The transmission curve shows a large absorption band at ^, and smaller depressions at and p. ~1. 0 / .? 3 •? S 5 89 FIG. 54.—Ebonite (a); Rubber. EBONITE. (t — mm. Curve a, fig. 54.) In fig. 54 is shown the transmission curve of ordinary ebonite, which has been ground thin, so that it was subtranslucent. It is quite trans- parent to 14 p., with absorption bands at , , , , , and 10 p., which are in coincidence with bands belonging to carbohydrates. PARA RUBBER. (Subtranslucent; t = mm.) In curve b, fig. 54, is given the transmission curve of a thin piece of sheet rubber. It is very opaque, but shows a large band at STIBNITE (Sb2S3). (Cleavage piece parallel to b; £ = , and mm. Fig. 55.) This is one of the most remarkable substances examined. It has a metallic luster, which is highly splendent on fresh cleavage 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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