Bulletin of the University of Texas; Scientific Series Volume N . 12-16

Bulletin of the University of Texas; Scientific Series Volume N . 12-16

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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. 1908 edition. Excerpt: ...of the design extend inward from the surface to a depth of about one-eighth of an inch, the rest of the tile being usually buff. Haw Materials.--Great care is necessary in the selection of the raw materials, for the clays used must be such that they will not form surface cracks after being dry-pressed. These cracks are caused by the escape of the air compressed between the clay particles during the process of molding. The clay should also be free from any tendency to warp or split in burning, and, furthermore, the manufacturer must aim to adjust his mixtures, or select his clays, so that the greatest number of colors can be burned at one temperature. Clays used for floor tile should also be as free from soluble salts as is the ease with those employed for the manufacture of pressed brick or terra cotta. although, as pointed out by Langenbeck,1 soluble lime salts may come from the coloring materials used. Thus the manganese and umber used for chocolates, browns or black are seldom free from gypsum. Floor tile when white are commonly made of a mixture of white-burning clays, flint and feldspar. Buff-colored tiles and artificially colored ones are usually made from fire clays, while red tiles are often made from a red-burning clay or shale. A certain amount of flint and feldspar is adde1l to the clay to regulate the shrinkage or degree of vitrification in burning. Method of Manufacture.--Floor tiles are always molded by the dry-press process in hand-power machines, the raw materials being first carefully ground and mixed. In making encaustic tile the design is produced by using a framework of brass strips, arranged so as to form the outline of the colors making the pattern. This framework is placed in the mold and the colored clays sifted into their...
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Product details

  • Paperback | 154 pages
  • 189 x 246 x 8mm | 286g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236502906
  • 9781236502902