General view of two unidentified men utilizing a Dearborn Chemical Company portable testing cabinet to conduct a water sample field test. 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. “Dearborn Chemical Company Water Sample Testing,” 1930–1939. BetzDearborn, Incorporated Records, Box 15, Folder 64. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/g445cf18w.
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