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Caoutchouc and Gutta Percha

Caoutchouc and Gutta Percha


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About the Book

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. 1852 Excerpt: ... CHAPTER III. PROPERTIES OF GUTTA PERCHA. Gutta Percha is imported into England in a variety of forms, some of which are represented in the annexed engraving. It differs in its state as raw material, very considerably, from the ap CURIOUS BLOCKS OF GUTTA PERCHA. pearance it presents when manufactured. Caoutchouc, on the contrary, presents nearly the same aspect after as before it has undergone the process of manufacture; its colour is but little altered, and its texture remains the same, except when vulcanized or otherwise modified. But the difference between raw and manufactured gutta percha is so striking, that no person unaware of the fact would be willing to believe them to be the same material. This is principally due to the existence of a vast amount of impurities in the raw material, much greater proportionally than is found in caoutchouc; in the latter, the principal adulteration is of an earthy character, but in gutta percha it is chiefly vegetable fibre, pieces of bark, and earthy matters intermixed. The appearance of a block of raw gutta percha is very similar to that of a piece of white or dirty yellow wood. It is hard, . scarcely indented by the nail, and might be well mistaken for a log of wood from which the bark had been removed. The shape of these blocks varies, as does also their size and quality. A large number have the form of a thick cake, not unlike that of linseed after having undergone hydraulic pressure; but others wear a more grotesque aspect, as may be conceived from the figures represented in the cut in the preceding page. The forms of uncouth animals, of monstrous heads, of birds, of lizards, serpents, crocodiles, and such like, are occasionally found among the heaps of the raw material brought to this country. These represent ei..


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Product Details
  • ISBN-13: 9781235864599
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1235864596
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr

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