A Treatise on the Natural and Chymical Properties of Water; And on Various British Mineral Waters

A Treatise on the Natural and Chymical Properties of Water; And on Various British Mineral Waters

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1830 edition. Excerpt: ...this process is to cause water that is foul to pass through the very minute pores of any substance not of itself capable of imparting any thing to the water; by this means every substance which is simply suspended in the liquor, but so intimately diffused as not to be separable by mere repose, is detained. in the filter, and the water passes through clear, limped, and free from all substances but those which it contains in chymical solution. This is a pro cess which is performed largely within the earth, and hence the reason why the purest waters are those which arise through clear sand or a siliceous rock. To imitate this natural process nothing is better than the porous free stone of which filtering stones are usually made. Sand, clear gravel, pounded glass, and other substances are equally fitted for this purpose. Filtra-tion maybe performed either by causing-the water to descend by its own weight through a porous substance, or to ascend through it by capillary attraction. Water sometimes contains putrescent vapours, which are not removed by this kind of filtration. By filtering through charcoal, however, these may be removed, and so far this must be preferable to the other species of filtration. It is to be observed that filtration will not produce any change in the chymical composition of the water, that in fact it will not render water less saline, or separate any thing that is truly dissolved, but only what is suspended. It has been supposed that sea water, when passing up through aconsiderable stratum of sand, may be deprived of its salt, as well as the impurities which visibly foul it. It is certain that very good fresh water is found by digging a few feet in the sand on the sea shore, at a very short distance from the high...show more

Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236916883
  • 9781236916884