Copy 1

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.

  • Parkinson, James, 1755-1824
Date:
1800
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.

    109/274 (page 91)
    Ne) a Origin of Piumbago seems to be principally owing T b a le part of the wood, which resisting the destructive action of to the ligneous, and truly in idecemposa Water, in its decomposition of vecetable substances, is disengaged from the other principles, and forms peculiar depositions, and strata. Chaptal. »In the dominions of the King of Naples, there are Wells dug expressly for a is purpose of collecting an acidulous water, at the ee ot which, quantity of Plumbago is colieéted every six months. Fabroni. The same gentleman supposes the black mud found beneath the pavement of Paris, is Plumbago formed in the humid way. _Plumbago is used for Pencils, for lubricating the surfaces, and thereby lessening the effect of friGtion of cer tain parts of machines, for defending Tron from rust, for polishing, é&c. _ The nature of Plumbago has received considerable illustration, from some late experiments and obser- vations on the DiaMon D. Newton conjectured the diamond to bea combustible body. Guyton, in 1785 inferred its: similarity ' to charcoal, from its leaving an effervescent Alkali, after combustion i in fused nitre. Lavoisier found that on burnin ng it in closed vessels, it yielded carvonic Acid. This ie also been proved by Mr. Tennant, who performed the combustion i in aerucible of Gold. Bertholler considered i it as erys~ rallized Charcoal. oe Since this, Guyton having burnt the diamond in 4 oxygen