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Subject Nitrogen--Fixation Remove constraint Subject: Nitrogen--Fixation

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    • 1925-Nov-06

    Group photograph of Fixed Nitrogen Research Laboratory personnel posed outside an unidentified facility. The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at American University in 1919 under the…

    • 1931

    General view of a glassblower, identified as L. Testa, working in an unidentified U.S. Department of Agriculture facility. Per a 1931 list of technical workers in the Department of Agriculture, Testa worked as a…

    • 1930s

    Two views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…

    • 1930s

    Three views of the experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed Nitrogen Research…

    • 1932-Oct-12

    General view of workers opening the cinder-notch on the No. 2 experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research…

    • 1930s

    General view of an experimental blast furnace at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant. The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at American University in…

    • 1934-Jan

    General view of the blowing out process for the experimental blast furnace at a Fixed Nitrogen Research Laboratory facility. The process of blowing out, also known as "raking out," is undertaken when production from a…

    • 1920s

    General view of an unidentified analytical apparatus and technician at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The Fixed Nitrogen Research Laboratory…

    • circa 1928

    General view of an apparatus used to determine the hygroscopicity of fertilizer materials and mixtures at the the Arlington Experimental Farm in Arlington, Virginia. The individual visible in the photograph is…

    • circa 1928

    General view of an apparatus used to determine the hygroscopicity of fertilizer materials and mixtures at the the Arlington Experimental Farm in Arlington, Virginia. The individual visible in the photograph is…

    • circa 1934

    Two views of apparatus and equipment used to produce an intermediate suitable for conversion to potassium metaphosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington,…

    • 1932-Oct-12

    General view of workers opening the cinder-notch on the No. 2 experimental blast furnace on a burden (a load, especially a heavy one) of phosphate at the U.S. Department of Agriculture's Fixed Nitrogen Research…

    • 1932-Jan-19

    General view of the carbon tube precipitator and spray tower for the experimental blast furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen…

    • 1932

    Two views of the Royster stoves used for the No. 2 experimental blast furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. According to notations accompanying…

    • 1932-Jan-19

    General view of the superstructure of the No. 2 experimental blast furnace, as seen from the platform of the No. 1 precipitator at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant.

    The Fixed…

    • 1932-Jan-19

    Two views of the No. 2 experimental blast furnace at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant. The individuals visible in the first photograph are identified (left to right) as Reilly;…

    • 1932-Jan-19

    Two views of the No. 2 furnace and stock piles at a U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory plant. The stock piles likely contained a mix of raw material, including greensand, leucite, coke,…

    • 1930-Mar-21

    General view of the blowing engines for the experimental blast furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individual visible in the photograph is…

    • 1930-Mar-21

    Three views of Mr. Royster (left) and Travis Hignett (right) tapping slag from the experimental blast furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Mr.…

    • 1927-Jul-26

    General view of culture samples used for an experiment to determine if corn growing under sterile conditions can use ammonia nitrogen. This experiment was conducted at the U.S. Department of Agriculture's Fixed Nitrogen…

    • 1930-Jan-08

    General view of an apparatus used to study the structure of molecules by means of the Raman effect using a three-glass prism Steinheil Spectrograph. This apparatus was used at the U.S. Department of Agriculture's Fixed…

    • 1930-Jan-08

    Two views of the liquid ammonia and carbon dioxide pumps and coolers at the Fixed Nitrogen Research Laboratory's Urea Plant. In the production of fertilizer, liquid carbon dioxide and liquid ammonia are commonly…

    • 1926-Apr

    Two views of Dr. F.E. Allison studying the fixation of nitrogen by bacteria at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research Laboratory…

    • 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…

    • 1930-May-28

    Two views of the construction of the phosphoric acid furnace at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. This furnace was used to make phosphoric acid through…