General view of Dearborn Chemical Company representative C.M. Kesler (seated) and hospital employee "Mike" examining a sample of water at Mary's Help Hospital (now Seton Medical Center) in San Francisco, California. Per notations accompanying the photograph, the water was treated with Dearborn compounds and subsequently analyzed for hardness. 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. “Water Sample Testing at Mary's Help Hospital,” August 18, 1936. BetzDearborn, Incorporated Records, Box 15, Folder 64. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/dn39x2299.
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