. Carnegie Institution of Washington publication. 68 INFRA-RED TRANSMISSION SPECTRA. POTASSIUM NITRATE (KNO»). (f = Curve a, fig. 56.) The section of this substance was made from the commercial material. It is conspicuous for its large absorption band extending from to ft, and a slightly smaller band at 12 There are absorption bands at , , , , to , , , , , and fji. Some of these bands coincide with sharp bands in silver nitrate. The reflection curve (x-x-x-x) shows a maximum at AMBER. (t = mm. Curve b, fig. 56.) Amber is a f
. Carnegie Institution of Washington publication. 68 INFRA-RED TRANSMISSION SPECTRA. POTASSIUM NITRATE (KNO»). (f = Curve a, fig. 56.) The section of this substance was made from the commercial material. It is conspicuous for its large absorption band extending from to ft, and a slightly smaller band at 12 There are absorption bands at , , , , to , , , , , and fji. Some of these bands coincide with sharp bands in silver nitrate. The reflection curve (x-x-x-x) shows a maximum at AMBER. (t = mm. Curve b, fig. 56.) Amber is a fossil resin. The section examined is too opaque to give us any -? £ 6 8 9 to II 12 FIG. 56.—Potassium nitrate ; Amber (b). 15 16-fi. FLUORITE (CaF2). In fig. 57 are shown the transmission curves of several pieces of fluorite, examined several years ago, but never published. They are given to show the difference between a perfectly white fluorite, curve a, and a greenish tinged variety, curve b. The latter shows a slight absorption band at In curve a, t = 2$ mm., and in curve b, t = mm., from which thickness it will be observed that if we cor- rect for reflection, white fluorite is perfectly transparent, while the green variety is likewise beyond p. This transparency has been observed by Rubens and others, and continues beyond 6 p., where it decreases to zero at 10 /*,. From the curves it will be seen that for certain work on radiation the green fluorites are just as serviceable as white ones, which latter are becoming difficult to 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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