The Elements of Experimental Chemistry, 第 2 卷Robert Desilver, 1831 |
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常見字詞
acetic acid albumen alcohol alkalis alumina ammonia analysis animal antimony appears arsenic atom baryta Berzelius blue boiling carbonic acid charcoal Chim chlorine colour combustion compound consists contain cooling copper crystals decomposed diluted dissolved distilled Ditto dried earths ether evaporation excess Fahr filtered fluid formed gallic acid gases Gay Lussac gelatine gold grains heat hydrogen hydrogen gas inches indigo insoluble Journ lime liquid liquor magnesia manganese matter mercury metal mineral mixed mixture muriatic acid nitrate nitric acid nitrous obtained olefiant oxalic acid oxide oxide of iron oxygen peroxide Phil phosphate phosphoric platinum portion potassa powder precipitate produced properties proportion protoxide pure quantity resin salt saturated separated silver soda soluble in water solution specific gravity starch substance sugar sulphate sulphureted hydrogen sulphuric acid tartaric tartaric acid taste temperature Thomson tion tube urine vapour vegetable washed weight yellow zinc
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第 135 頁 - The acids should be allowed to digest three or four days, with a heat which ought gradually to be raised. The solution, being then poured off, should be suffered to stand until a quantity of fine pulverulent ore of iridium, suspended in the liquid, has completely subsided; and should then be mixed with 41 parts of sal ammoniac, dissolved in about five times their weight of water.
第 134 頁 - 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.
第 449 頁 - 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.
第 144 頁 - ... cake of the sulphuret, after being fused, is to be finally purified by cupellation, in an open crucible, with borax and a little nitre. The sulphuret is then to be roasted, at a low red heat, on a flat brick, and pressed, when reduced to a pasty consistence, into a square or oblong and perfectly flat cake. It is again to be roasted very patiently, at a low red heat, until it becomes spongy on the surface. During this process, sulphur flies off in the state of sulphurous acid, especially at those...
第 117 頁 - One hundred grains (or a greater proportional quantity, not exceeding 500) are to be dissolved, 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.
第 495 頁 - WEIGHTS. The Paris pound, poids de mark 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 grains, and is equal to 702 1 Paris grains.
第 52 頁 - ... point of a knife. 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.
第 515 頁 - NB — If the materials are mixed at a warmer temperature than that expressed in the table, the effect will be...
第 144 頁 - ... sulphurous acid, especially at those moments when the heat is allowed occasionally to subside. The ingot is then to be cooled ; and when quite cold, is to be tapped with a light hammer, in order to condense and beat down the spongy excrescences on its surface. The alternate roastings and tappings (or gentle hammerings) require the utmost patience and perseverance, before the cake can be brought to bear hard blows ; but it may, by these means, at length be made so flat and square, as to bear being...
第 122 頁 - ... 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.