Memoir on sulphuric ether / By John Dalton.

  • Dalton, John, 1766-1844.
Date:
[1820]
Catalogue details

Licence: Public Domain Mark

Credit: Memoir on sulphuric ether / By John Dalton. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    Table of the Forces of Aqueous, Alcoholic, and Ethereal Vapours. Temperatures Aqueous vapour. Ra- Alcohol vapour. Ra- Ethereal vapoar. (common scale). tio,2-6. tio, 2-7. Ratio, 2. 36° 0-29 in. 0-56 in. 7-5 in. 64 0-75 1-51 15-0 96 1-95 4-07 (/) 30-0 132 5-07 (a) H-00(g) 60-0 173 13-18 (^») 29-70 {h) 120-0 220 34-20 (c) 80-20 (0 240-0 272 88-90 {d) — —. 340(e) 231-00 — — Dr. Ure's numbers for ether corresponding to the above, the last exclusive, are 6-55, 13, 25-7, 49-8 [49], 96-4 ; the ratio is of course less than two, and a descending one ; namely, 1-98, 1-97, 1-94, and 1-93; this last circumstance characterizes a mixed liquid. I have not extended the experiments on ether further than 212° ; but as that temperature gives a force of 207 or 209,1 esti- mate the force to be 240 at 220° nearly. If the forces registered in the preceding table be allowed as near approximations to the truth, it must> 1 think, be admitted that they increase in geometrical progression to the same inter- vals of temperature for a range of 200° at least. Whether those intervals of temperature are equal one to another successively is another inquiry, which the above facts and observations do not enable us to decide. Anali/sis of Ether by Electricity, S)C. When a little fluid ether is let up into Volta's eudiometer, either over mercui-y or water, and a small portion of azotic gas is likewise sent up, in order to be vapourized by the ether ; then if the vapourized air be electrified for an hour, some perfr \neiit gas is produced, and charcoal is precipitated. The gas 'when washed is chiefly or wholly carburetted hydrogen ; for i' takes two volumes of oxygen, and yields one of carbonic acid gas. If the vapourized gas be dry and over mercury, a volume of vapour yields two volumes of carburetted hydrogen, and moisture is perceived within the tube. If the electrification were continued. (a) Southern, 471. Ure, 4-70 (A) Soulhern, 1300. Ure, 12-95. (c) Southern, .33-20. Ure, 35-50. (rf) Southern, 88-00+. Ure, 89 00. 90. The mean of my two tables. (e) This observation is Mr. Southern's. There is reason to su-^pect his tempera- tures loo higli for his forces ill the high nressures. They e.\ceed Dr. Ure's (/) Ure, 4-02. (g) Ure, 11-20. (A) Ure, 30-00. (>) Ure, 78-50. Betlan, 82.