General view of employee E.L. Konigsmark recording water samples sent to the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant for analysis. Founded in 1887, the Dearborn Chemical…

Close-up view of employee A.R. Sherwood at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. A row of Bunsen burners are visible on the work bench. Per notations…

Close-up view of employee Gardner Abbott conducting a test to determine the viscosity of oils at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn…

General view of employee Ted Slisz at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. An assortment of beakers is visible on the work bench. Founded in 1887, the Dearborn…

General view of employee Ted Slisz using a balance at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

General view of an unidentified employee analyzing unidentified substances at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. A row of Bunsen burners are visible on the work…

General view of employee Charles S. White analyzing unidentified substances at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory…

General view of employee C.C. Dennis using a mortar and pestle to crush specimens for use at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in…

General view of employee Anton H.R. Noreen preparing samples for testing at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

General view of employee Anton H.R. Noreen conducting an analysis of coal samples at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the…

General view of employee Anton H.R. Noreen at work at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility, with view of the laboratory work bench, assorted glassware, and scientific…

General view of employee Al Slisg conducting a water analysis test at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. Founded in 1887, the Dearborn…

General view of several employees conducting water analysis tests at the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. The three employees visible in the…

General view of an unidentified employee at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. A variety of titration equipment and other scientific apparatus are visible on…

General view of employee Al Herman analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Assorted scientific apparatus and laboratory glassware…

General view of an unidentified employee analyzing an unidentified substance at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. A microscope and water quality test kit are…

General view of employee A. Sherwood preparing agar and gelatin plates for use in the bacteriological analysis of water at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded…

General view of employee Al Woodward preparing polished plates for a corrosion test at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

General view of employees Charles S. White (left) and C.C. Dennis (right) using balances at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

General view of employee W. Crocker at work in the factory control work area of the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Per notations accompanying the photograph,…

General view of employee A. Sherwood using an extraction rack at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Per notations accompanying the photograph, the extraction rack is…

General view of employee Genevieve Work in the Receiving Room at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Per notations accompanying the photograph, the Receiving Room was…

General view of the exterior of the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of several large storage tanks. Founded in 1887, the Dearborn Chemical Company was a…

General view of two unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…

General view of two unidentified employees filling barrels at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a corporate…