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University of California Publications in Botany Volume N . 7

University of California Publications in Botany Volume N . 7


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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. 1922 edition. Excerpt: ...divided than the product of our pebble mill. Table 3.--Influence Upon The Results Ok Analysis Of Final Grindino In A Coffee Mill And In A Pebble Mill SjM'rics 87 C. n. 133 C. n. 134 C. n. 135 C. n. 140 C. n. 144 C. n. 140 C. n. gnaphalode viriiluhis viridulus viridulus consimilis consimilis consimilis Although, as in all such cases, a far larger number of analyses is necessary to give entirely reliable evidence it appears from the figures given above that the product of the pebble mill, irrespective of the fact that some rubber is kept behind on the pebbles, yields approximately as large an amount of rubber as does the product of the coffee mill. The results given in the following table leave no room for doubt that rubber does adhere to the pebbles. Table 4.--Evidence That Rubber Adheres To The Pebbles When Material Is Ground In A Pebble Mill 200 Species Haplopappus nanus Acetone Extract Per cent. 9.57 8.71 8.88 Benjene Extract Per cent. 6.72 6.22 8.51 Remarks Coffee mill. Pebble mill. 4 hours. Pebble mill. 4 hours. Pebbles washed in benzene and solution filtered. Residue (2gm.) added to ground material (3gm.) and whole extracted with filtrate. In view of these results the conclusion seems inevitable that the degree of fineness of the ground material is an important factor in the extraction of rubber from non-latex rubber-bearing plants according to our method of chemical analysis. Apparently the added fineness of the product of the pebble mill facilitates the thorough extraction of the rubber to such an extent that the amount of rubber added by this more nearly complete extraction compensates for the amount retained upon the pebbles. In other words if over 2 per cent of rubber is held on the pebbles, as is indicated by the results given in table...


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Product Details
  • ISBN-13: 9781153570770
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 138
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1153570777
  • Publisher Date: 01 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 259 gr


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