This paper describes the use of an older style of glass prism in a new spectrophotometer made by Beckman Instruments. This new spectrophotometer would become the Model B, the glass prism making it a cheaper alternative to the DU, which used a crystal prism.
Stickney, M. E., Arnold O. Beckman, D. C. Strain, George H. Hare, W. C. Miller, and K. P. George. “A New Spectrophotometer Employing a Glass Fery Prism,” May 1949. Beckman Historical Collection, Box 17, Folder 16. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/kk91fm322.
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