October 1942. "Colorado School of Mines at Golden. Chemical prospecting for oil becomes more important as the war goes on and the demand for oil increases. Petroleum engineers call chemical prospecting the first scientific approach to the detection of oil in the earth. The big glass condensers, with which these engineering students are working with a professor of geophysics, are used in a soil analysis test. The percentage of wax left as residue at the end of the experiment indicates the nearness of petroleum to the site from which the soil sample was taken." Photo by Andreas Feininger, Office of War Information.
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