Manufacture of Leather

Manufacture of Leather

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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. 1922 edition. Excerpt: ...may be extracted by it. For use on sumac or like materials, which do not allow of an initial extracting temperature of boiling water, the material is weighed into a cup b that has a perforated brass bottom and rests' on a perforated plate 11 of the outer vessel a. Water is placed in the vessel a surrounding the cup b and is kept at the desired temperature by heat applied to the bottom of a. Suspended over cup b is an inverted vessel c filled with water and having an outlet e at a higher level than that of tube f. Cocks g and h are closed and cock 1' is opened, and water is allowed to fiow into the cup. When the desired temperature is attained, cock 1' is partly opened and percolation begins, the extractives being delivered through cock 1' at any desired speed, additional water flowing from c as the level falls below the opening e. When the strong extractives have been removed, cock 7' is closed and some of the water surrounding b is drawn off through cock k until about 600 cubic centimeters of water remains in the bottom of a. The inverted vessel c is removed and to the flanges at l is attached a conical cap to the apex of which a condenser tube is brazed. An annular ring fitted to the interior surface of the cap serves to guide the water of condensation, so that it falls into the cup b. The water in a is then boiled and the condensed steam falling into the cup b completes the extraction. The extractives may be delivered directly by closing cock g and opening either h or 1'. If continuous operation is desired, cocks h and j are closed and cock g is opened, and the extractive is returned to the lower part of a. 27. The Teas Peroolator Extractor.--The Teas percolator extractor, shown in Fig. 6, may be used on all new materials, but a...show more

Product details

  • Paperback | 44 pages
  • 189 x 246 x 2mm | 95g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236887042
  • 9781236887047