Skip to Content
You searched for
Search
Subject United States. Department of Agriculture Remove constraint Subject: United States. Department of Agriculture Subject Scientific apparatus and instruments Remove constraint Subject: Scientific apparatus and instruments

Search Constraints

Search Results

    • 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,…

    • 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…

    • 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…

    • circa 1928

    Two views 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 established…

    • 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

    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 the Instrument Shop at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory showing assorted machinery and tools. The individual visible in the photographs is identified as Mr. J.E.…

    • 1926-Apr

    Two views of the Instrument Shop at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory showing assorted machinery and tools. The individual visible in the photographs is identified as Mr. J.E.…

    • circa 1928

    Two views 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 first photograph is…

    • 1930-Jan-08

    Two views of a thermostated agitating device with an all-glass system used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The term "thermostated" refers to a…

    • 1928-Aug-21

    Three views of the carbon monoxide generator and compressor used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individual visible in the second and third…

    • 1950s

    General view of an unidentified apparatus, possibly a hopper or type of granulation equipment, at an unidentified U.S. Department of Agriculture facility, likely the U.S.D.A.'s Agricultural Engineering Laboratory. Three…

    • circa 1935

    General view of assorted equipment and apparatus in the Constant Humidity Room at the the U.S. Department of Agriculture's Fertilizer Machinery Laboratory located at the Arlington Experimental Farm in Rosslyn…

    • 1950s – circa

    General view of a variety of tools used to handle radioactive substances and other materials at U.S. Department of Agriculture facilities. The tools are labelled with numbers, presumably corresponding to an…

    • 1950s

    General view of an unidentified apparatus at a U.S. Department of Agriculture facility. A radioactive materials sign and protective glass panel are visible to the right of the apparatus. The U.S.D.A. commonly used…

    • 1950s

    Close-up view of the interior of an apparatus likely used for the manufacture and/or testing of fertilizer at an unidentified U.S. Department of Agriculture facility.

    • 1950s

    Component parts, likely of a drillability apparatus, used at an unidentified U.S. Department of Agriculture facility.

    • 1930s

    General view of an unidentified apparatus, possibly a pump or compressor, used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.

    The Fixed Nitrogen Research…

    • 1935

    Close-up view of the mounting frame and driving mechanisms of the fertilizer distribution testing apparatus used in the U.S. Department of Agriculture's Fertilizer Machinery Laboratory located at the Arlington…