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Bureau of Mines Interior Dept., [Washington, DC], between 1910 and 1920. Man using viscosimeter, instrument used to measure the viscosity of a fluid. On the right is a "TAG" closed tester made by G. J. Tagliabue Manufacturing Company, Brooklyn, New York. The United States Bureau of Mines (USBM) was the primary US government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources. Bureau of Mines Interior Dept., between 1910 and 1920. Creator: Harris & Ewing. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)