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:8 Another original machine, which Bud Spencer is driving, loosens the dirt around the nursery plants when they have been topped. The roots go straight down for eight to twelve inches and this operation makes it simple for the laborers to gather them, one of the few hand processes in the growth of guayule. Dr. David H. Spence, Stanford University rubber chemist, maintains that the cheapest way to grow guayule is to harvest the plants when they are at this stage. William O'Neil, General Tire's president, believes this system should be adopted for emergency development of a rubber supply.
:10 One year old seedling, showing hundreds of flowers. Each flower produces five seeds. Estimated production for a mature plant is between two and five thousand seeds per year. Present seed collecting device, to date, has only collected about ten seeds per plant. Therefore, this device needs perfecting.
:16 From this plant which Juan holds can be extracted a quantity of real rubber equal to 23 per cent of the weight of the plant. The rubber comes from the roots and branches, only the leaves having no rubber content. This plant is seven years old. At this age it reaches its peak in rubber content.
:23 Another seed collecting device that was first developed collected the seed from one row. Apparently these machines are rather inefficient as they have only been able to collect ten seeds per plant, while it is estimated each plant can produce from two to five thousand seeds per year.
:29 The first settling tank. The wood silt becomes water logged and goes to the bottom. The rubber floats, together with some cork, the latter being removed by forcing water into the air cells of the cork under 350 pounds pressure, which sinks in the settling tank. This picture is out of order, and should be in following the next two.
:38 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.
:40 Major Kelley, Senator Downey and Dr. D. Spence. Dr. Spence advocates the planting of the seed thick in the spring and harvesting in the fall, and states that his experiments show that he could get 1170 pounds of pure rubber per acre, which he maintains can be produced at a great deal less cost, and a great deal quicker, than under the transplanting plan.
:41 The Truman Committee in Salinas investigation [sic] guayule rubber, being beseiged [sic] by the mothers of 186 Salinas boys with General McArthur, requesting that something be done to help their boys. Left to right, Senator Kilgore, West Virginia, Senator Ball, Minnesota and Senator Downey, California.