. Radiometric investigation of water of crystallization, light filters and standard absorption bands . e very sharply 90% a s b-0-4 ^fci b . 80 \ 11 a 1 76 0 60 11 I 1 1 Z£ 50 |f n SM 1 40 J I 3020 n 1 1 \l 6/P- 10 1 t ^ t O/ 2 3 4 5 6 7 8 Fig. 11.—Gelatin (Curve b After Dehydration) 10/t bounded region of great opacity at 6 to 8/x is characteristic of car-bohydrates containing N02 groups. There are absorption bandsat , , , , , , , , , , , and *. Oleic acid, C17H33COOH.—This substance was examined toobtain a check on previous work done with a rock-salt pr
. Radiometric investigation of water of crystallization, light filters and standard absorption bands . e very sharply 90% a s b-0-4 ^fci b . 80 \ 11 a 1 76 0 60 11 I 1 1 Z£ 50 |f n SM 1 40 J I 3020 n 1 1 \l 6/P- 10 1 t ^ t O/ 2 3 4 5 6 7 8 Fig. 11.—Gelatin (Curve b After Dehydration) 10/t bounded region of great opacity at 6 to 8/x is characteristic of car-bohydrates containing N02 groups. There are absorption bandsat , , , , , , , , , , , and *. Oleic acid, C17H33COOH.—This substance was examined toobtain a check on previous work done with a rock-salt prism andto arrive at an explanation of the peculiar absorption bandsfound in olive oil and in linseed oil. In all cases the film of oil or Coblentz] Water of Crystallisation 649 acid was contained between clear fluorite plates, separated by aring of tinfoil mm in thickness, curve c, figure 12. The paraffin oils have a series of harmonic bands at , ,, (), and 14/x. In the fatty acids the region of ^ and7/a is complex and a large absorption band is found at to T 2 3 4 5 6 7 8 9 IOjlo Fig. 12.—Olive Oil (a); Linseed Oil {b); Oleic Acid (c). Thickness^.007 mm The latter band was sometimes found in some of the heavierparaffin oils when the absorption cell was exposed to previous investigations the intense band at was foundin all substances containing the C = O group, as in COOH. It wasalso found that in passing from a saturated fatty acid (stearic 22 See Figs. 64, 72, and 73, Publication No. 35, Carnegie Institution of Washing-ton, 1905. 650 Bulletin of the Bureau of Standards Woi. 7, No. 4 acid, C17H35COOH) to an unsaturated fatty acid (oleic acid,C17H33COOH) there is no marked change in the absorption spec-trum. The most noticeable feature, as the number of CH2 and CH3groups increases, is the disappearance of small bands at , and an increase in sharpness of the , , , bands which are
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