The brochure discusses the use of the IR-2 spectrophotometer in an air pollution study. Though undated, the referenced instrument models and logo narrow the date of the brochure's publication to somewhere between the late 1940s to 1956, with 1955 suggested by comparison to the content of subsequent brochures in the series.
Beckman Instruments, Inc. “Beckman Infrared Notes: Battelle Uses 175 Foot Long Air Path in Smog Studies,” circa 1955. Beckman Historical Collection, Box 17, Folder 38. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/sj139239k.
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