The Elements of Experimental Chemistry, Band 2

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R. Desilver, 1819
 

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Seite 63 - ... are sufficient to produce the full effect, in the shade several hours are required, and light transmitted through different coloured glasses acts upon it with different degrees of intensity. Thus it is found that red rays, or the common sunbeams passed through red glass, have very little action upon it ; yellow and green are more efficacious, but blue and violet light produce the most decided and powerful effects.
Seite 391 - Paris pound, fioids de marc of Charlemagne, contains 9216 Paris grains; it is divided into 16 ounces, each ounce into 8 gros, and each gros into 72 grains. It is equal to 7561 English troy grains. The English troy pound of 12 ounces contains 5760 English troy grains, and is equal to 702 1 Paris grains.
Seite 414 - Mixtures, having the power of generating or creating cold, without the aid of ice, sufficient for all useful and philosophical purposes, in any part of the world at any season.
Seite 315 - The agency of the alkalies and earths may, however, be prevented, by previously saturating them with a few drops of the same acid in which the silver is dissolved. 3. The nitrate and acetate of silver are decomposed by the sulphuric and...
Seite 54 - Into a dilute solution of muriate of gold, contained in a glass jar, put a long narrow slip of charcoal, and expose the whole to the direct light of the sun. The gold will be revived, and will appear on the charcoal in a metallic state, exhibiting a very beautiful appearance. The same change ensues without light, if the solution be exposed to a temperature of 212°.
Seite 311 - ... apparent, unless after standing some time in contact with the air. By applying this test before and after evaporation, or boiling, we may know whether the iron be held in solution by carbonic acid, or by a fixed acid. For, 1. If it produce its effect before the application of heat, and not afterward, carbonic acid is the solvent. 2. If after, as well as before, a fixed and vulgarly called mineral acid is the solvent. 3. If, by the boiling, a yellowish powder be precipitated, and yet galls continue...
Seite 328 - It remains, therefore, first to discover and estimate the quantities of the bases present, and then, to complete the analysis, to find the quantity of muriatic acid originally contained. Add to the clear liquor a saturated solution of oxalate of ammonia as long as any turbid appearance is produced. The lime will be thrown down in the state of oxalate.
Seite 68 - Dissolve 100 grains of mercury with heat, in a measured ounce and a half of nitric acid. This solution being poured cold upon two measured ounces of alcohol, previously introduced into any convenient glass vessel, a moderate heat is to be applied till effervescence is excited. A white fume then begins to* undulate on the surface of the liquor, and the powder will be gradually precipitated «n the cessation of action.
Seite 55 - The degree of purity of gold is expressed by the number of parts of that metal, contained in the 24 parts of any mixture. Thus gold, which in 24 such parts (termed carats,) contains 22 of the pure metal is said to be 22 carats fine. Absolutely pure gold, using the same language, is 24 carats fine ; and gold alloyed with an equal weight of another metal, 12 carats fine-t Platinum.
Seite 120 - If two long trains be laid on a table, the one of gunpowder and the other of this mixture, and they be in contact with each other at one end, so that they may be fired at once, the arsenical mixture burns with the rapidity of lightning, while the other burns with comparative slowness, 28.

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