Transactions of the Dublin Society for the Year Volume 2, PT. 2

Transactions of the Dublin Society for the Year Volume 2, PT. 2

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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. 1802 edition. Excerpt: ...as galls. The sulphat of iron is obtained by dissolving a small quantity of iron in oil of vitriol, diluted with water, or by dissolving green copperas in water. This solution serves to ascertain such substances as contain the gallic principle. Lime water will also produce this effect. When the liquor ceases to grow blacks by the mixture of the sulphat of iron, it will be useless to pour any more-water on the tan in the first digester. This tan being exhausted both of the tanning and gallic principles must be removed, and new tan put in its place. 2. You will observe that the liquor, after running through all the digesters, at last grows weak. Add to your stock of tanning lixivium, all the liquor that marks from six to eight degrees on the hydrometer. What proceeds afterwards from the last digester, is to be poured on the new tan in the first. Then the fresh water is to be conveyed on. the tan in the second digester, and the liquor of the first to be laid by, while it marks six or eight degrees on the hydrometer, and added to the tanning lixivium, which must always be carefully separated from the gallic. In this manner the tan in all the digesters may be renewed and the lixiviations comtinued. The number of these lixiviations, as well as the mode of making them, may be Varied at pleasure; the essential point is to repeat them so as to give the liquor a sufficient degree of concentration, which may be determined by the hydrometer, and proportioned to the quickness required in the operation, and the thickness of the hides and skins to be tanned; all which experience will soon teach. As all kinds Of tan are not equally good, it will sorne times happen j that six or more nitrations will be necessary to obtain a lixivium of six or eight degrees; in...show more

Product details

  • Paperback | 96 pages
  • 189 x 246 x 5mm | 186g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236512782
  • 9781236512789