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Genre Photographs Remove constraint Genre: Photographs Genre Charts, diagrams, etc Remove constraint Genre: Charts, diagrams, etc Subject United States. Bureau of Chemistry and Soils Remove constraint Subject: United States. Bureau of Chemistry and Soils

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    • circa 1928

    Diagram of an apparatus used to determine nitrogen in the presence of hydrogen. Several component parts of the apparatus are labelled, including a circulating device, combustion tube, and topler pump. The diagram itself…