The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson.

  • James Parkinson
Date:
1807
Catalogue details

Licence: Public Domain Mark

Credit: The chemical pocket-book, or memoranda chemica; arranged in a compendium of chemistry ... with Bergman's table of single elective attractions / as improved by Dr. G. Pearson. Source: Wellcome Collection.

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    a similar power. He ascertained that this power is developed in the highest degree by heat and light: and extending ljis ex- periments with an improved apparatus, part of which was a tube IS inches long, in which the pieces of charcoal, each weighing 36' grains, were exposed to the gaseous matters, he found that I. lines. of the air of the Privy, there were absorbed 8 . 0 House 8 . 6 Garden 7 . 6 of Carbonic acid gas ] 6 . 6 or Hydrogen gas 3 . 1 Nitrogen 6 . 1 Oxygen 12 . 3 in the first four hours, and on the eighth day the gas was wholly absorbed. M. Morozzo found that charcoal lost much of this power by passing through mercury: and that the pieces of charcoal ac- quired from half a grain to two grains, according to the ab- sorption.—Journal tie Physique. An. xii. Charcoal, in its common state, contains so much hydrogen, that carburetted hydrogen may be obtained from it even after it has ceased to yield carbonic acid. Perhaps in its purest state it may become so imbued with hydrogen gas as to explain its yielding carburetted hydrogen gas even after it has ceased to yield carbonic acid. It is indeed by some supposed that the hydrogen enters into its composition as one of its principles, and that therefore it ought not to be considered, as it has been by some, as a pure carbonous oxide. Thus was Mr. Hatchett almost led to consider it, in consequence of some observations he made ; but farther ob- servations made him feel on this subject very considerable doubt.—Phil. Trans. 1805. It decomposes water at the common temperature, carbonic acid and carbonated hydrogen beiitg separated.—Lampadius. It powerfully resists the putrefaction of animal substances;