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…

Elevated view of employees Charles S. White (left) and Andrew Lombardi (right) at work in the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Per notations accompanying the…

General view of employee Charles Andrew operating a rolling machine at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company was a…

Close-up view of employee Charles Andrew at work in 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 two rows of Bunsen burners in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Per notations accompanying the photograph, the burners are being used to burn…

General view of three Bunsen burners in use at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. The employee visible in the photograph is identified as Irin Crocker. Founded in…

General view of employee Tom Cryan filling a barrel with water treatment chemicals produced at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn…

Close-up view of employee A.R. Sherwood calibrating a concentration hydrometer at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company…

General view of employees A.H. Reynolds and Rea Grimberg at work in the research room at the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical…

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 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 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 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 employees E.P. Fager and Viola Suess at work in an office at the Dearborn Chemical Company's 35th Street laboratory facility located in Chicago, Illinois. An unidentified chemist, visible through the…

General view of an employee in the Bureau of Chemistry's Water and Beverage Laboratory conducting an analysis on an unidentified substance. Assorted sample jars and scientific apparatus are visible in the photograph.…

Volume is a survey of studies for the improvement of steam power plant efficiencies from the perspective of applied chemistry. Describes the analyses and tests necessary for various materials used in the powerhouse.…

General view of assorted water samples sent to the Dearborn Chemical Company's 35th Street Laboratory for analysis. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of BetzDearborn, Incorporated…

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 an unidentified employee at work in a store room at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant, with view of assorted barrels and other containers. Founded in…

General view of several unidentified employees packing materials for shipment at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company…

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

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 an unidentified female laboratory technician preparing a water sample for analysis at the Dearborn Chemical Company's 35th Street Laboratory. Founded in 1887, the Dearborn Chemical Company was a…

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