The Beckman DK Spectrophotometer was an enhancement of the DU, which expanded the instrument’s range of into near-infrared. This was accomplished by chemist Wilbur I. Kaye, who began his work on science behind the DK at Eastman Kodak, and continued it after he was hired by Beckman Instruments. The model DK is named after him and his innovation.
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“Beckman DK-2A Ratio Recording Spectrophotometer on Bench beside Power Supply,” circa 1957. Beckman Historical Collection, Box 83. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/g158bh51g.
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