Close-up view of chemist Francis Ptak holding a rack of Nessler tubes at a Gascoyne Laboratory facility located in Baltimore, Maryland. A Perkin-Elmer automated, multi-element spectrophotometer is visible in the background. Per notations accompanying the photograph, Ptak is posed with the Nessler tubes to illustrate the contrast between antiquated and modern methods of metals analysis at the laboratory.
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Perkin-Elmer Corporation. “Gascoyne Laboratories Facility in Baltimore, Maryland,” 1970–1979. Photographs from the Perkin-Elmer-Applera Collection, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/gh93h036t.
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