The Beckman DB spectrophotometer was a double beam model, which allowed for comparison between two light paths: a reference and the sample being measured.
Beckman Instruments. “Beckman Model DB Spectrophotometer Instruction Manual,” 1960. Beckman Historical Collection, Box 106, Folder 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5h73pw14h.
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