Arnold O. Beckman (L), founder of Beckman Instruments, Inc., stands with Robert T. Sheen (middle) and W. G. Brombacker (R) beside a Ratio Recording Spectrophotometer at a meeting of the Instrumentation, Systems, and Automation (ISA) Society. Sheen was president of the Milton Roy Company of Philadelphia, Pennsylvania, and the President Elect of the ISA. W. G. Brombacher, of the National Bureau of Standards, was the Secretary Elect of the ISA at the time of this photograph. The Ratio Recording Spectrophotometer (also known as the DK-2) was sold by Beckman Instruments in 1955, and could record three spectral ranges: ultraviolet, visible, and near-infrared.
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“Arnold O. Beckman, Robert T. Sheen, and W. G. Brombacher with a Ratio Recording Spectrophotometer,” September 15, 1955. Beckman Historical Collection, Box 55, Folder 126. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/1r66j118d.
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