Chemistry and Metallurgy as Applied to the Study and Practice of Dental Surgery

Chemistry and Metallurgy as Applied to the Study and Practice of Dental Surgery

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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: ...coarse, and only slightly moistened and compressed, the cupel will be porous, break easily, and allow the metal to pass through it in small globules. Should it be too fine, too wet, and too strongly compressed, the cupels are too solid, cause much delay, and demand a very high temperature for the completion of the cupellation. The operation of cupellation will be described under the head of Metallurgy of the Alloys of Silver, so that it will not be necessary to say anything about it in this place. LUTES. The term lute is derived from lutum, mud, and is used to express any substance employed for closing the joints of a chemical apparatus. The only lutes with which we have any concern at present, are the fire-lutes. These are used to secure the joints of apparatus subjected to high furnace-heats. Parker's fire-lute is composed of clean clay 2 parts, sharpwashed sand 8 parts, horsedung 1 part. These are intimately mixed, and afterwards thoroughly tempered. Watts, s fire-lute is made of finely powdered porcelain clay, mixed to the consistence of thick paint, with a solution of borax, containing 2 ounces of borax to the pint of water. Faraday's lute is made of the best Stourbridge clay, worked into a paste, and beaten till it is perfectly ductile and uniform. It is then flattened out into a cake, of such a size and shape as shall be most easily applied to the vessel to be coated. If this be a retort, it should be placed in the middle of a cake, which should be raised upon all sides, and gradually moulded and applied to the glass; if it be a tube, it should be laid upon one edge of the plate, and applied by rolling the tube forward. The surface to be coated should always be rubbed with a piece of the lute dipped in water, for the purpose of more

Product details

  • Paperback | 162 pages
  • 189 x 246 x 9mm | 299g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236586255
  • 9781236586254