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    • 1920s

    General view of an unidentified laboratory facility looking toward the supply store from the perspective of the chief's office, with inscriptions indicating the location of offices and work benches associated with…

    • 1920s

    General view of an unidentified laboratory facility looking toward the chief's office from the perspective of the supply store, with a side view of various offices and work benches. Notably, the photograph is printed as…

    • 1920s

    Close-up view of an electrolytic apparatus at a laboratory work bench attributed to the U.S. Bureau of Standards. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing…

    • 1920s

    General view of an unidentified employee analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. A microscope and water quality test kit are…

    • 1920s

    General view of employee Al Herman analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory glassware…

    • 1920s

    General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. A variety of titration equipment and other scientific apparatus are visible on…

    • Pasteur Institute - Classroom
    • circa 1920

    Postcard depicts three men and one woman working in a laboratory at the Pasteur Institute.

    • circa 1924

    General view of an extraction rack in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as A. Sherwood. Per notations…

    • circa 1924

    General view of a work bench in the factory control work area of the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as W.…

    • circa 1924

    General view of employee Anton H.R. Noreen conducting an analysis of coal samples at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the…

    • circa 1924

    General view of employee Anton H.R. Noreen preparing samples for testing at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

    • circa 1924

    General view of employee C.C. Dennis using a mortar and pestle to crush specimens for use at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in…

    • 1924

    General view of an unidentified female laboratory technician preparing a water sample for analysis at the Dearborn Chemical Company's 35th Street Laboratory. Founded in 1887, the Dearborn Chemical Company was a…

    • circa 1924

    General view of the Receiving Room at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as Genevieve Work. Per notations…

    • circa 1924

    General view of balances in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph are identified as Charles S. White (left) and C.C.…

    • 1925

    General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

    • 1925

    General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

    • 1925

    General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

    • 1926-Apr

    General view of an apparatus used to measure the effect of radiation on chemical reactions at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen…

    • 1926-Apr

    General view of an apparatus used for the emission of positive ions at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individuals present in the photograph are…

    • 1926-Apr

    J.F. Shultz demonstrating use of an apparatus to test water gas catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The term "water gas" commonly refers to…

    • 1926-Apr

    General view of an apparatus used to measure the thermionic properties of catalyst surfaces at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. In chemistry, the term…

    • 1926-Apr

    R.A. Nelson (left) and Dr. C.H. Kunsman (right) demonstrating an apparatus used to study the decomposition of ammonia on catalyst surfaces at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory…

    • 1926-Apr

    Two views of an apparatus used to measure the solubility of methane in hydrocarbons under high pressures at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The…

    • 1926-Apr

    Two views of an apparatus used to oxidize ammonia with pure oxygen using bed catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individual visible in the…