Cyclopa E Dia of Chemistry; With Its Applications to Mineralogy, Physiology & the Arts

Cyclopa E Dia of Chemistry; With Its Applications to Mineralogy, Physiology & the Arts

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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. 1854 edition. Excerpt: ...of bird cherry, elder, poplar, maple, and walnut, previously deprived of bark. The charring is performed in an iron retort or cylinder resembling a gas retort, at a high temperature. The sulphur on the continent is usually employed in the condition of roll sulphur. The materials are separately introduced into oak mortars, which are set in a series, and pulverized by means of pestles or stampers, which are worked by machinery like the flint mill at a pottery, or stampers at a bleachfield. The mortars are 14 inches in diameter. The materials are moistened with water into a paste. In France the pulverization is made in revolving wooden or leathern drums containing metallic balls of different sizes. A third, and more common method, is to pound the materials separately by means of millstones formed of cast iron, sometimes enclosed in a ring of bronze. Pressing.--The powder, properly ground and thoroughly mixed, is conveyed to the press. The powder is arranged in layers separated by metallic plates, and is subjected to intense pressure in a Bramah press, or it is placed on cloths and pressed between rollers on endless cloths. The nature of the metals employed as separating media is important; Muntz's metal has been found most durable in standing the pressure. The condensation by this process is so great as to reduce the cake formed to one-fourth of its original bulk. Graining or Corning.--The broken cake is made to pass between a series of rollers; the first armed with long teeth, the second series having finer teeth, and the last being smooth. The powder thus formed is sifted in brass wire sieves, having apertures suited to the kind of powder required; or the broken cake is first placed in parchment or leathern sieves and pressed upon by a disc of...
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Product details

  • Paperback | 438 pages
  • 189 x 246 x 23mm | 776g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236575202
  • 9781236575203