Some remarks on hydrocyanic acid / [John Thomas Cooper].

  • Cooper, John Thomas, 1790-1854.
Date:
[1839]
Catalogue details

Licence: Public Domain Mark

Credit: Some remarks on hydrocyanic acid / [John Thomas Cooper]. Source: Wellcome Collection.

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    XXXIV. Some remarks on Hydrocyanic Acid. By J. T. Cooper, Esq., Lecturer on Chemistry, §c.* IN the month of November 1831 I prepared some anhydrous hydrocyanic acid, by passing a current of dry sulphuretted hydrogen through a tube containing dry cyanide of mercury, and condensed the product by a freezing mixture surrounding the receivers; almost immediately after its preparation its specific gravity was taken at the temperature of 37° Fahr., which was found to be 0*706; and in two hours and a half after its preparation, I proceeded to determine its refractive index, by inclosing a portion of the acid in a perfectly air¬ tight hollow prism, whose refracting angle was 49° 151 40, which, adopting the notation of Sir J. F. W. Herschel, we will call z. I; then by a very simple instrument which 1 am in the habit of using for these purposes, the angle D, or that made by the incident and refracted ray, was found to be for Frauenhofer’s ray A 14° 4F, and for ray H 15° 13f 30. Hence by adopting Sir J. Herschel’s formula, viz. g — sin (M) 1 sin — 2 in which expression g represents the refractive index, we have r . I) for ray A — = 7° 2O' 30 A extreme red = 24 37 50 log. sin. 9*61989 A = 31 58 20 log. sin. 9*72387 Temp. 37° jx = 1*2705 log. 10398 „ TT D and for ray H „ = 7 36 45 A extreme violet •— = 24 37 50 log. sin. 9*61989 At (5 4- - 32 14 35 log. sin. 9*72714 y = 1*2801 log. *10725 * Communicated b}' the Author, from whom it was received in the course of last month.—Edit.