Rubber press which presses the rubber into blocks of 100 pounds each - two blocks to a box. This rubber contains about 18 or 20 percent resin and other impurities. One of the problems is the elimination of this resin and particularly, the elimination of the impurities. Dr. D. Spence is working on a plan of purification of guayule rubber. :38

Courtesy of UC Berkeley, Bancroft Library

http://www.oac.cdlib.org/ark:/13030/tf038nb1d4/?order=1

Title:

Rubber press which presses the rubber into blocks of 100 pounds each - two blocks to a box. This rubber contains about 18 or 20 percent resin and other impurities. One of the problems is the elimination of this resin and particularly, the elimination of the impurities. Dr. D. Spence is working on a plan of purification of guayule rubber.

Contributing Institution:

UC Berkeley, Bancroft Library