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Subject California Fruit Growers Exchange Remove constraint Subject: California Fruit Growers Exchange

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    • Personal Recollections of Arnold O. Beckman
    • Undated

    The account focuses on the early days of Beckman's entrepreneurial endeavors, from Robert Millikan referring I. H. Lyons to Beckman for assistance with National Postal Meter Company inks through the renting of a new…

    • circa 1933

    Glenn Joseph writes to Dr. Beckman about the process of finding the right buffer to use in the new glass electrodes inside the pH meter. The identify of the "Dr. Dupont" referenced in this letter is uncertain.

    Arnold…

    • 1933

    In this letter, Glenn Joseph reports that the vacuum-tube amplifier in the early Beckman pH meter model is (still) not functioning properly. One of the fixes he proposes is replacing the vacuum tubes with a glass…

    • 1934-Jun-22

    This letter spells out the instrument maintenance and upgrades that the California Fruit Growers Exchange believe are included with the cost of developing the "glass electrode apparatus" (an early prototype of the…

    • 1934-Apr-09

    Directions for calibrating a McLeod gauge for use with the early model of the Beckman pH meter. This letter is likely related to the handwritten McLeod gauge diagrams and calculations also found in this folder. At the…

    • 1934-Jun-25

    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…