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Home > History and Archaeology > History > Cantor Lectures on Gutta Percha; Delivered November 29, December 6, 13, 1897
Cantor Lectures on Gutta Percha; Delivered November 29, December 6, 13, 1897

Cantor Lectures on Gutta Percha; Delivered November 29, December 6, 13, 1897


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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. 1898 Excerpt: ...was washed with a 5 per cent. solution of sodic hydrate, then with water, rolled out into sheet, and analysed as before. The analysis now gave only s-2 per cent. of water and 0-4 per cent. of dirt. This experiment clearly shows that the treatment with the alkaline solution not only reduced the percentage of dirt to less than one-fourth of the original amount, but it also affected the capacity for retaining mechanically enclosed water. The treatment of gutta percha with hot alkaline solutions, or lyes, or in fact with 0) The block after having been cut open was photographed in the ordinary way, and is shown in Fig. 3-, No. 4; one of the rolls of White Bulongan, containing a stone, was shown after the lecture with the Rontgen apparatus. Other stones found embedded in blocks on cutting them open, are represented in Nos. 7 and 8. any other chemicals, requires great care and judgment, and the subsequent washing with water must be done very thoroughly; otherwise the material may be detrimentally affected and perish afier a comparatively short time. Chem1cal Harden1ng Process. I will now describe the process for hardening gutta percha which I introduced about 16 years ago. As you will remember, I pointed out in the last lecture that the really valuable constituent of gutta percha is the gutta, and the more a material contains of it the better it is, provided the gutta itself is of good description. Now, for certain purposes, it is advantageous to improve the hardness and other mechanical properties of guttapercha, and this can be done by extracting the resin with a suitable solvent which leaves the gutta itself intact. I have here some cubes of raw gutta percha immersed in different liquids, and you observe that they have retained their original form and sharpness...


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Product Details
  • ISBN-13: 9781236449733
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 46
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1236449738
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 100 gr

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Cantor Lectures on Gutta Percha; Delivered November 29, December 6, 13, 1897
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