In this letter, Evans discusses a new electrode design for use in Beckman pH meters.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry.
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Evans, Clare. “Letter from Clare Evans to Arnold O. Beckman,” August 26, 1937. Beckman Historical Collection, Box 14, Folder 9. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/qj72p728d.
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