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.

    90/320 (page 70)
    If now we seek to determine the specific rotation of pure oil of turpentine from the more dilute solutions only, we get for A in the formula [a] = A + Bq + C?3 values showing the following divergences:— From Solu We obtain Divergence Solvent. tions A = : from 37-01 Alcohol i—i i—i M M 1—1 IV., IV., y. y. 37*20° 35-13° + 0- 19° 1- 88° Benzene I HI-, V., yi. 37-26° + 0-25° \ V., VI., yn. 35-42° - 1-59° Acetic Acid , II., IV., VI. 36-65° _ 0-36° IV ■ V., VI. 36-00° - 1-01° Extra- polation 30 per cent. 50 35 63 22 49 Hence the divergence from the real value may amount, in some cases, to a whole degree, when the solutions contain more than 50 per cent, of solvent. II. Right-handed Oil of Turpentine. § 31. The American oil here employed had a specific gravity of 0-91083-. For determining the rotation of the pure oil and its mixtures Wild’s and Mitscherlich’s instruments were used, but at the time these observations were made the experimental tubes had not been furnished with water-baths. The temperature of the liquid was ascer- tained at the conclusion of the measurements by a thermometer inserted into the tube. a for Instrument. Temperature. L = 219'90 millims. [“Id* Wild 21-2° 28-354° 14-156° Mitscherlich 21-0° 28-315° 14*137° Mean: [a]D = 14*147°. Mixtures with Alcohol. The following mixtures were prepared :— 1 Number of Mixture. Oil of Turpentine V• Alcohol Q- d. c. I. 73-0927 26-9073 0-87648 64-0643 II. 47*5124 52-4876 0-84642 40-2154 III. 22-2443 77-7557 0-81864 1 18-2101