General view of an unidentified female model demonstrating use of a Perkin-Elmer Model 21 Infrared Spectrophotometer. Notably, the Perkin-Elmer Model 21 was designed as the first linear wave-number versus transmittance recording spectrophotometer.
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Perkin-Elmer Corporation. “Perkin-Elmer Model 21 Infrared Spectrophotometer,” 1950–1959. Photographs from the Perkin-Elmer-Applera Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/wd375x11z.
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