Handbook of the polariscope and its pracitcal applications / adapted from the German editon of H. Landolt, by D.C. Robb and V.H. Veley.

  • Hans Heinrich Landolt
Date:
1882
Catalogue details

Licence: Public Domain Mark

Credit: Handbook of the polariscope and its pracitcal applications / adapted from the German editon of H. Landolt, by D.C. Robb and V.H. Veley. Source: Wellcome Collection.

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    the solutions emploj^ed have not been recorded. The complete data are given only for:— Lcevo-rotatory camphene. Terecamphene, C10 H16, obtained by heat- ing terebenthene-chlorhydrate with an alcoholic solution of potash or with stearate of soda. Riban (Bull. soc. chim. 24, 10) found for alcoholic solutions with q = 62 to 90 per cent, alcohol, at a tempera- ture of 13° to 14° : [a]D = — (53*80 — 0*03081 q). § 117. Ethereal Oils. Commercial ethereal oils, being invariably mixtures of sub- stances often of opposite optical powers, exhibit so much diversity in respect of rotation values, that these are of no use as a test of their purity, and special data are accordingly worthless. § 118. Resins. Euphorbone, C15 H24 O (from euphorbia resin). Dextro- rotatory. Chloroform. c = 4. t — 15. [a]D = 18-8. Hesse (L. A. 192, 195). Ether. {d = 0-72). c — 4. t — 15. [a]D — 11’7. Podocarpic acid, C17 H22 03. Dextro-rotatory. Alcohol, c — 4 to 9. [a]D = 136. Ether, c = 4 to 7. [a]D = 130. Sodium salt, C17 H21 Na 03 -f 8 H2 O. Water. c = 4*6. [o]D = 82. v „ c = 6-4. [o]D = 79. „ 6- = 13-8. [<*]„ = 73. Alcohol of 93 per cent, c — 9 [a]D = 86. J Oudemans (L. A. 166, 65). § 119. Camphors. Laurel-camphor, C10 H16 O. Dextro-rotatory. For specific rotation in various solvents (§ 36, p. 84). The following others have been obtained :— Alcohol of 80 per cent, c — 2 6 10 [a]* = 40.9 39-25 38-65 [ Hesse Chloroform, e = 5. [«]D = 44‘2 ) (L- A- l76’ 119)‘ Arndtsen (A. C. P. [3] 54, 418) has determined the specific rotation in alcoholic solutions for different rays, and with different