RUBBER FROM OIL 



Color Sound U. S. Bureau of Mines 



30 minutes Free Loan 



This is a story of substitutes. Research chemists worked inde- 

 fatigably to devise a formula for making rubber from oil to de- 

 velop a synthetic rubber that could be vulcanized. A number of 

 factors led to the use of dry ice which made possible vulcanization 

 and resulted in what is called butyl rubber. Problems remained, 

 however, as to how strong (air proof, tensile, weather proof) the 

 substitute would be. After many tests a small pilot plant was built 

 and proved successful, but while the pilot plant proved the value of 

 butyl rubber, it took World War II to prove its mass distribution 

 value. Under pressure many plants worked at top speed to con- 

 tribute synthetic rubber to the war effort. 



Peace offered a new challenge for there are 40,000 articles using 

 natural rubber. The final sequence of the film is concerned with the 

 satisfactory production of rubber for auto tires and linings, boots 

 and shoes, and everything from a workable hose to footballs and 

 baby clothes. A good example of a film on man-made substitutes 

 and highly important because it raises the issue as to the amount 

 of drain man-made substitutes make on natural resources. 



AUDIENCE: Senior high; college 



TREASURES OF THE EARTH 



Color & Black & White Sound Churchill Films 



11 minutes Rental Sale 



Illustrated with charming and imaginative animation, this film 

 tells the story of mineral deposits in the earth. It reviews ancient 

 forces acting on the earth's crust and the resultant changes, and 

 then goes on to show how minerals tend to be concentrated by 

 being deposited in veins, washed into stream beds and low areas, 

 and by seeping through the earth in solution. A sequence describes 

 how oil is trapped in the earth's folds and how coal is formed. 



Thanks to a logical identification with young people through the 

 use of live photography plus a spirited sound track, this film helps 

 the student to relate the age-old process of earth change to his 

 personal experience with rocks and minerals. A very entertaining 

 introduction to the subject of non-renewables. 



AUDIENCE: Elementary; junior high 



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