General view of employees (left to right) Ray Shoan, Charles S. White, Andrew Lombardi, and Bernard Tarley conducting water analysis tests at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Several portable Dearborn water quality test kits are visible on and beneath the front work bench.
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. “Employees Conducting Water Analysis at Dearborn Laboratory Facility,” March 16, 1934. BetzDearborn, Incorporated Records, Box 17, Folder 14. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mc87pr33q.
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