Letter regarding the possible contents of and functioning of the glass electrode in the first pH meter models.
Arnold Beckman invented his first pH meter in 1934 at the request of Glenn Joseph, 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.
Beckman, Arnold O. “Letter from Arnold O. Beckman to Glenn Joseph,” June 25, 1934. Beckman Historical Collection, Box 14, Folder 8. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/k643b1207.
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