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…

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…

General view of several employees at work in the Dearborn Chemical Company's 35th Street laboratory and manufacturing facility located in Chicago, Illinois. The three employees visible in the foreground are identified…

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…

Close-up view of employee Irin Crocker 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…

General view of employee Jack Cooney operating a boiling tank used in the manufacture of liquid water treatments at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in…

General view of employee James Nelson at work in the Dearborn Chemical Company's 35th Street Laboratory facility and manufacturing plant. An assortment of beakers and laboratory apparatus are visible on the work bench.…

General view of employee Joe Korn operating a boiling tank used in the manufacture of liquid water treatments at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887,…

Close-up view of machinery used in the production of water treatment chemicals at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company…

Close-up view of machinery used in the production of water treatment chemicals at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn Chemical Company…

General view of employee Walter Perry filling a barrel with an anti-foam water treatment produced at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn…

Close-up view of raw material and machinery used in the manufacture of water treatment chemicals at the Dearborn Chemical Company's 35th Street laboratory facility and manufacturing plant. Founded in 1887, the Dearborn…

Close-up view of scientific apparatus used at the Dearborn Chemical Company 35th Street laboratory facilities located in Chicago, Illinois. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

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…

Print advertisement for ethylene dibromide manufactured and sold by the Dow Chemical Company for use in Ethyl gasoline. The advertisement features a seascape and an illustration of a mermaid, with accompanying text…

General view of an unidentified employee preparing a water sample for testing at a Dearborn Chemical Company's laboratory facility in Chicago, Illinois. A stamp on the verso of the photograph for "The Fensholt Company,"…

Color print advertisement for a variety of activated carbons manufactured and and sold under the trade name "Cliffchar" by the Cliffs Dow Chemical Company, a subsidiary of the Dow Chemical Company located in Marquette,…

Telegram from Henrietta Nesbitt (1874-1963), White House cook and housekeeper, to W.H. and L.D. Betz asking for an additional twenty gallons of the specially fabricated London city water to be delivered to the White…

Letter from First Lady Eleanor Roosevelt to Edwin M. Ross in which Roosevelt accepts Ross's offer to analyze and duplicate London city water which would be used to serve tea to the King and Queen of England.

Letter from Malvina C. Thompson (secretary to First Lady Eleanor Roosevelt) to Edwin M. Ross instructing him that the samples of water fabricated by Betz Laboratories to duplicate London City water has arrived. Mrs.…

Thank-you letter from First Lady Eleanor Roosevelt to Betz Laboratories for fabricating water identical to that found in London, which was then delivered to the White House and used for the tea served to the King and…

Color print advertisement for a variety of activated carbons manufactured and and sold under the trade name "Cliffchar" by the Cliffs Dow Chemical Company, a subsidiary of the Dow Chemical Company located in Marquette,…

Color print advertisement for Dowmetal, a magnesium alloy manufactured and sold by the Dow Chemical Company. The advertisement features waves moving across the sea, with accompanying text commemorating Dow's production…

Color print advertisement for magnesium alloys manufactured and sold by the Dow Chemical Company. The advertisement depicts a group of pirates digging for buried treasure, with accompanying text summarizing Dow's…