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Subject United States. Department of Agriculture Remove constraint Subject: United States. Department of Agriculture

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    • 1928-Aug-21

    General view of the thermostat and apparatusused to measure vapor pressures in the study of Urea synthesis at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Urea is a…

    • 1928-Aug-21

    General view of the thermostat, apparatus, and analytical train used to measure vapor pressures in the study of Urea synthesis at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…

    • 1927-Jul-26

    General view of an apparatus used to oxidize ammonia at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

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

    • 1927-Jul-26

    General view of an experimental apparatus to test the production of hydrogen from methane and steam at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed…

    • 1927-Jul-26

    General view of the ammonia-carbon dioxide pump and Urea autoclave used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research Laboratory…

    • 1930-Jan-08

    General view of an autoclave and still at the Fixed Nitrogen Research Laboratory's Urea Plant. Urea is a water-soluble powder form of carbonic acid frequently used as a fertilizer and feed supplement.

    The Fixed…

    • 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 1927

    V.L. Gaddy demonstrating an apparatus used to create a constant-temperature bath to determine the equilibrium of Urea, a water-soluble powder form of carbonic acid frequently used as a fertilizer and feed supplement, at…

    • 1930-Jan-08

    General view of a carbon dioxide drier, compressor, liquifier, and liquid storage used at the Fixed Nitrogen Research Laboratory's Urea Plant. Urea is a water-soluble powder form of carbonic acid frequently used as a…