July 18, 2011
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< br /> This phosphorus, after being exposed a few minutes to the sun \ rays, shines in the dark sufficiently to render visible the dial of a watch.
436. Sulphate of barytes, artificially formed , is composed of about 66 barytes and 34 acid to the 100.
437 – Sulphate of Lime is found native in great abundance, and is known under the names of plaster of pans, gypsum, Sic. It is chiefly employed as a manure. It is also used as a cement.
Obs. It contains about 21 per cent of water, which is easily evaporated when the salt is exposed to a low red heat. What remains, is an impalpable powder of a beautiful white. This powder is composed of jordan air lirne 58, add acid 42 = jordan shoes online 100.
438. jordan sneakers Sulphate of Magnesia, or Epsom salt. This salt is obtained by the evaporation of the water of some springs which contain it in solution. It is also found in sea water, and is sometimes prepared jordan release dates from what is called the bittern, which remains after jordan shoes website the common salt is extracted. It is easily composed by mixing together its ingredients, sulphuric acid diluted with water and magnesia.
OAs. Sulphate of magnesia crystalizes in the form of small
exposed to the air; is very soluble in water and undergoes a watery fusion when exposed to heat. lis principle use is as a medicine. It is composed of water 50, acid 33.5 and magnesia 16.5 to the 100.
439 – Sulphate of Alumine. new jordan Common alum. The alum of commerce is dug out of the earth, jordan spizike where it is found in the native state, sometimes tolerably pure and in large masses, and sometimes diffused in beds of clay, or slate, or intermixed with various other substances.
OAs. 1. When it is found ready formed in earths, or friable minerals, it is extracted by collecting the earth into proper vessels, and pouring on water, which jordan shoes passes through, dissolves the alum anil holds in solution. The water is then evaporated until the salt crystalizes.
2. When the mineral which furnishes this salt is an aluminous clay mixed with sulphur and iron , another method is taken. Here, although most of the ingredients which form alum are present, yet no salt is formed. To form the salt the clay containing the iron and sulphur is exposed to heat, or merely to the air until the sulphur becomes acidified or converted into sulphuric acid, this then unites to the alumine and forms a sulphate. If no potash be present in the earth, a quantity is added, as this is necessary to form alum. The clay is then treated by lixiviation and evaporation as above.
3. The uses and common properties of alum are so well known as to need no description.
440. A combination of alumine, sulphur, and charcoal
lllus. To prepare buy jordan shoes this, powder an ounce or two of alum and mix with it an equal quantity of brown sugar. Put the mixture into jordan basketball shoes a ladle, or earthen dish, and keep it stirring over a fire until all the water is driven off. Then pulverize it finely, and introduce it into a common vial coated with a mixture of clay and sand. Lute to the mouth of the vial a small glass tube, or stem of a jordan outlet tobacco pipe, to allow the moisture jordan store and gases to escape. The vial must thsn be set in a crucible surrounded by sand, and the whole set in a fire and gradually heated to redness. Water will soon issue from the end of the tube, and afterwards a gas, which on being lighted, burns with a blue flame. After the flame goes out, keep up the heat for about fifteen minutes, and then remove the crucible from the fire, and immediately stop the orifice of the tube with a piece of clay. Wl: en the vial is cool enough to be handled, the pyrophorus must be hastily poured into warm and perfectly dry vials and corked from the air. It will be in the form of a black powder.
