General view of Dearborn Chemical Company employee E.P. Fager comparing the color of two solutions during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are visible on the table. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of BetzDearborn, Incorporated best known for manufacturing water treatment chemicals for use in boilers and cooling towers.
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Dearborn Chemical Company. “E.P. Fager Conducting Dearborn Chemical Company Water Sample Field Test,” 1930–1939. BetzDearborn, Incorporated Records, Box 15, Folder 64. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5x21tg38b.
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