General view of Wilson Walker, Chief Chemist at the Ohio Department of Health's Sanitary Chemistry Laboratory, injecting a sample of drinking water into the cylinder of a Perkin-Elmer Heated Graphite Atomizer (HGA). Per…

General view of an unidentified female employee pouring a water sample into the tray of a Perkin-Elmer Autosampler at an Environmental Protection Agency (EPA) laboratory facility located in Edison, New Jersey. Per…

General view of an unidentified employee operating a Perkin-Elmer Atomic Absorption Spectrophotometer with a heated graphite atomizer (HGA) attachment in use at a Calgon Water Management laboratory facility. Per…

General view of a Perkin-Elmer Grating Infrared Spectrophotometer in use at a Calgon Water Management laboratory facility. Per notations accompanying the photograph, the spectrophotometer is being used to characterize…

General view of a Perkin-Elmer Model 337 Grating Infrared Spectrophotometer in use at a Calgon Water Management laboratory facility. The female technician visible in the photograph is unidentified.

General view of an unidentified chemist operating a Perkin-Elmer gas chromatograph in an Environmental Protection Agency (EPA) Region II laboratory located in Edison, New Jersey. Per notations accompanying the…

General view of employee Jack Guillaumin (right) and an unidentified chemist reviewing the results of an analysis conducted by a Perkin-Elmer Model 306 Atomic Absorption Spectrophotometer in a laboratory at the Detroit…

General view of a Perkin-Elmer Atomic Absorption Spectrophotometer in use at a Calgon Water Management laboratory facility. Per notations accompanying the photograph, the spectrophotometer is equipped with a…

General view of laboratory technician Richard Thomson preparing water samples for testing at the New York City Bureau of Water Supply's Ben Nesin Laboratory. Per notations accompanying the photograph, a Perkin-Elmer…

Beckman's Microtox Acute Water Toxicity Monitor debuted in 1979.

This recorder was used with Beckman's Microtox Acute Water Toxicity Monitor.

Beckman's Microtox Acute Water Toxicity Monitor debuted in 1979.

In 1968, Beckman's Advanced Technology Operations group introduced the MINOS Dissolved Oxygen Meter (DOM), capable of measuring dissolved oxygen in seawater at depths of 3,000 meters.

The photograph of the instrument…

General view of employees at work in the Analytical Laboratory at the Dearborn Chemical Company's 35th Street laboratory facility located in Chicago, Illinois. The two employees visible in the foreground of the…

Group photograph depicting United States President John F. Kennedy (center) pushing a button to activate the nation's first salt-water conversion plant located at the Dow Chemical Company facility in Freeport, Texas.…

General view of the sea water intake apparatus at the Dow Chemical Company plant located in Freeport, Texas. Dow commonly processed sea water to obtain magnesium, the world's lightest structural metal.

General view of employees (left to right) Ruth Johnson Dugo, Lillian Kazmierzki, Valentine I. Miciulis, and Serge Levicki at work in the Analytical Laboratory at the Dearborn Chemical Company's 35th Street laboratory…

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 Dearborn Chemical Company employee C.B. Smith utilizing a concentration hydrometer during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are also visible on the…

General view of Dearborn Chemical Company engineer F.B. Horstmann utilizing a portable testing cabinet to conduct a water sample field test. A stamp on the verso of the photograph for "The Fensholt Company," a public…

General view of Dearborn Chemical Company employee E.P. Fager preparing a water sample for testing. A stamp on the verso of the photograph for "The Fensholt Company," a public relations firm based in Chicago, suggests…

General view of Dearborn Chemical Company employee E.P. Fager comparing the color of two solutions during a water sample field test. Assorted glassware and a Dearborn portable testing cabinet are visible on the table.…

General view of two unidentified men utilizing a Dearborn Chemical Company portable testing cabinet to conduct a water sample field test. Founded in 1887, the Dearborn Chemical Company was a corporate ancestor of…

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…