General view of an oxygen analyzer used to measure the contents of purified nitrogen during the early stages of nylon production and research at the DuPont Experimental Station in Wilmington, Delaware. To protect hot nylon polymers from oxidation, DuPont notably used a purified grade of nitrogen that became known as "Seaford-grade nitrogen" after the company's nylon plant located in Seaford, Delaware.
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“Oxygen Analyzer at DuPont Experimental Station,” August 28, 1938. Joseph X. Labovsky Collection of Nylon Photographs and Ephemera, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/4f16c289p.
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