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    • 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

    General view of the exterior of the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory facility located at American University near Washington, D.C. The Fixed Nitrogen Research Laboratory (F.N.R.L.) was…

    • 1926-Apr

    W.E. Kuentzel demonstrating use of an apparatus for the removal of carbon monoxide from water gas by means of preferential combustion at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…

    • circa 1926

    Apparatus used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory to study the separation of ammonia from carbon dioxide.

    The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at…

    • 1926-Apr

    Dr. M.F. Fogler demonstrating an apparatus used for the dissociation of nitric acid at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research…

    • 1926-Apr

    Dr. E.W. Guernsey demonstrating an apparatus used to study the formation of nitric oxide in the explosion of carbon monoxide and oxygen at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located…

    • 1926-Apr

    Dr. C.D. Garby demonstrating an apparatus used to study the formation of nitric oxide in flames at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen…

    • 1926-Apr

    L.A. Pinck demonstrating an apparatus used for the nitration of organic substances at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research…

    • 1926-Jun

    Portrait of (left to right) Dr. Albert Baird Hastings (1895-1987) and Dr. James A. Hawkins posed in a laboratory at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.). Best known for the study…

    • 1926-Apr

    Dr. Sebastian Karrer using an apparatus to measure the thermal conductivity of active nitrogen at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen…

    • 1926-Apr

    R.J. Connor photographing the spectrum of active nitrogen at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. In chemistry, "spectrum" commonly refers to the…

    • 1926-Apr

    Dr. E. C. White demonstrating an apparatus used for the automatic analysis and indication of the carbon monoxide content of a gas stream at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located…

    • 1926-Apr

    J.F. Shultz demonstrating an apparatus used to analyze the effect of phosphine upon ammonia catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed…

    • 1926-Apr

    Mr. E.H. Johnston demonstrating an apparatus used for the production of ozone at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research…

    • 1926-Apr

    Dr. D.C. Bardwell inspecting the apparatus used for the fixation of nitrogen by alpha rays at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen…

    • 1926-Apr

    Two views of an apparatus used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory to test catalysts at 1 to 100 atmospheres of pressure. Key components of the apparatus are visible in the…

    • 1926-Apr

    Mrs. M.K. Murray demonstrating use of a nitrometer, an apparatus used to determine the amount of nitrogen or nitrogen compounds in a substance or mixture, at the U.S. Department of Agriculture's Fixed Nitrogen Research…

    • 1927-Jul-26

    General view of the construction and calibration of an apparatus used to analyze the decomposition of ammonia on hot surfaces at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…

    • circa 1927-Jul-26

    R.A. Nelson (left) and E.S. Lamar (right) demonstrating an apparatus used to study the decomposition of ammonia on hot catalyst surfaces by means of the coated strip method. This apparatus was used at the U.S.…

    • 1927-Jul-26

    Dr. R.O.E. Davis demonstrating use of an apparatus for filling tubes in order to study ammonia-carbon dioxide-Urea-water systems at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…

    • 1927-Jul-26

    C.A. Black demonstrating use of an apparatus for filling tubes in order to study ammonia-carbon dioxide-Urea-water systems at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…

    • 1927 – 1928

    General view of employees E.P. Fager and Viola Suess at work in an office at the Dearborn Chemical Company's 35th Street laboratory facility located in Chicago, Illinois. An unidentified chemist, visible through the…

    • 1928-Aug-21

    General view of an apparatus used to study the relative activity of potassium ions and electrons in the synthesis of ammonia from nitrogen and hydrogen gas at the U.S. Department of Agriculture's Fixed Nitrogen Research…

    • 1928-Aug-21

    General view of an apparatus used to study the thermal decomposition of ammonia of the surface of tungsten, molybdenum, nickel, and iron catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research…

    • 1928-Aug-21

    General view of assorted apparatus used in the Fixed Nitrogen Research Laboratory's High-Pressure Laboratory, including a hydraulic pressure pump, piston-type gauges, high-pressure booth, and valve manifold. The…