Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1801. Excerpt: ... and for this reafon retorts of earthen-ware or porcelain muft be employed. The pureft kind of oxygen gas, however, is that difengaged from the oxygenated muriate of potafh by heat alone. This operation may be performed in a glafs retort; and the gas obtained is perfectly pure; which feems to prove, in oppofition to what Bertliollet has faid (1075), that light is not eflential to the formation of oxygen gas. Combinations of Combujlibh Bodies with each other. 1077. As combuftible Jubftances take up oxygen with great avidity, they muft have a great affinity for each other: and this indeed is proved by obfervation. Almoft all the metals combine with each other; and the refult is compounds, called Alloys. Thefe fnbflances are more brittle than the pure metals; efpecially when the alloyed metals differ greatly in their degree of fufibility. "When iron is alloyed with a very fufible metal, it often breaks while hoc, and rather fo than when cold; becaufe this fufible metal fufes at a gentle heat, which breaks the continuity of the parts. The alloy of mercury with other metals often forms only a pafte called Amalgam. 1078. Sulphur, phofphorus, aj;d charcoal, alfo combine with metals. The firft of thefe combinations was formerly.!nown by the name of Pyrites: at at prefent it is called Sulphuret. The fecond combination, or that of phofphorns, is called Phofphuret; and the third, or that of charcoal, Carburet. 1079. Hydrogen, that fubftance fo highly combuftible, combines alio in the ftate of gas with feveral combuftible fubftances: it difiblves fulphur, phofphorns, and carbon, and forms thofe varieties of hydrogen gas, of which we have already fpoken (301, 308, 312). It is to the emanation of fulphurated' hydrogen gas that the foetid odour of animal dejections is pr...
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