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:
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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    however, is accomplished very slowly without heat; but it is formed much more rapidly if sulphuric acid be added to the mixture of water and phosphuret. They are fusible, and ca- pable of decomposition at high temperatures; they may be also decomposed by a long continuance, even of the lower temperatures. Carburet, or the compound of metal with carbon, can only be instanced in that of iron. Since though carbon is sometimes found in zinc and manganese, yet it is in combina- tion with iron. There are no known combinations of the metals with ni- trogen or hydrogen ; although the sulphuretted hydrogen is capable of holding metals in solution, particularly iron, zinc, and arsenic. PLAT!NA is obtained, in a granular state, from Peru, blended with siliceous sand, iron, and several other metals. The com- binations in which these substances are here found to exist, are, according to Descotils, chromate of iron, ferruginous oxide of titanium, copper, and iron, each in union with sul- phur, and a considerable portion of iron in union with the pla- tina itself. With these he was satisfied also exists a metal which had not yet been examined. Platiua is of a white colour, Sp. gr. when hammered 22,5, being the most ponderous of all known bodies. It may be rendered malleable and ductile; but it is harder than all the metals except iron. Its fusion takes place beyond the highest degree of Wedgwood's pyrometer, in the hear produced by powerful burning glasses, or that excited by oxygen gas; and it can only be made to burn by the galvanic or electric spark: but it will not combine with oxygen by the strongest heat of a furnace. Like iron it has the property of welding. Various modes have been recommended to give malleability to platina, but Mr. Tillock proposes the simple method of