Volume 2

Experiments and observations on different kinds of air, and other branches of natural philosophy, connected with the subject ... / being the former six volumes abridged and methodized, with many additions. By Joseph Priestley.

  • Priestley, Joseph, 1733-1804.
Date:
1790
Catalogue details

Licence: Public Domain Mark

Credit: Experiments and observations on different kinds of air, and other branches of natural philosophy, connected with the subject ... / being the former six volumes abridged and methodized, with many additions. By Joseph Priestley. Source: Wellcome Collection.

    475/496 (page 459)
    the form of tahlesy of the time at which the mer- cury reached all the degrees of the fcale, both in afcending and defcending; which tables I have drawn up. But this I fliall defer till I have an op- portunity of repeating all the obfervations. At pre- fent I would only obferve, that all the differences were not fo ftriking as I expedted to have found them, but that inflammable air conducted heat much better than any other kind of air, the mercury afcend- ing the fame fpace in about half the time that it took up in common air. Fixed aivy and all the kinds of acid aivy conducted heat confiderably worfe than common air. Alkaline air conducted heat rather better than the acid airs, and dephlogifticated air a little worfe than common air, but fo little, that I would not anfwer for the fame refult in repeating the experiment. N. B. In the courfe of thefe experiments, I could not avoid obferving fo great an expanfion of alkaline air by heat, that I conclude the obfervation, p. 450, may be perfedly accurate, though the extraordinary nature of it made me entertain the doubt I have there expreffed cocicerning it.