General view of assistant chemist Lawrence Koerber using a Perkin-Elmer Model 403 Atomic Absorption Spectrophotometer to test an ash sample in a Peabody Coal Company laboratory. Per notations accompanying the photograph, the spectrophotometer employs a flame mode of operation to examine samples of coal and ash, part of the company's ecological, environmental, and exploration programs.
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Perkin-Elmer Corporation. “Perkin-Elmer Atomic Absorption Spectrophotometer in Use at Peabody Coal Company Laboratory,” 1970–1979. Photographs from the Perkin-Elmer-Applera Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/s1784m74w.
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