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. 1785 edition. Excerpt: ...intimated. It may, however, be N 4 obtained obtained by various means. An ounce of nitre, exposed to heat in a pneumatic apparatus, affords 500--600 cubic inches of air, far better, especially at first, than common air. Nitrous acid poured upon many metals and earths, and then abstracted to dryness, yields ...
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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. 1785 edition. Excerpt: ...intimated. It may, however, be N 4 obtained obtained by various means. An ounce of nitre, exposed to heat in a pneumatic apparatus, affords 500--600 cubic inches of air, far better, especially at first, than common air. Nitrous acid poured upon many metals and earths, and then abstracted to dryness, yields first nitrous air, if any phlogiston be present, and then more or less of vital air. Vitriol of iron, copper, and zinc, and various vitriolated earths, nay, lapis calaminaris, manganese, and the calces of the noble metals acquired by precipitation, afford, when exposed to a due degree of heat, a portion of vital air during their reduction. Hence it may be justly concluded, that this air can indeed be obtained without nitrous acid, but that by means of it a much larger quantity is procured, so that it is scarce to be doubted but that it enters as a principle into the acid, or the acid into it. In the former supposition, something must be removed, which when when again added to the vital air in proper quantity, must impart to it, besides other properties, a strong acidity. The nature of this is unknown. Nitrous air alone is at least insufficient, unless the existence of phlogiston be denied, which, however, would be contrary to evident experiments; nor does it seem to be the inflammable principle, by which, on other occasions, all the acids are debilitated, and, when fully saturated, are as it were fettered. It should, however, be remembered, that compounds sometimes have properties not belonging to either of the ingredients. But in the case in question, this bare possibility is unsupported by any experiment, which shews that distinct acidity proceeds from phlogiston. The latter proposition is countenanced by the following considerations. It...
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