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Genre Manuscripts Remove constraint Genre: Manuscripts Format Text Remove constraint Format: Text Format Image Remove constraint Format: Image Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable Remove constraint Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable

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    • 1954-Mar-28

    This series of handwritten and -drawn notes relates to the development of the Beckman DU-X2 spectrophotometer. One of the pages appears to be missing.

    The first Beckman Instruments DU Spectrophotometer was developed in…

    • 1946-Apr-08

    Handwritten and -drawn notes detail the resistors used in the Model F pH meter.

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate…

    • 1931-Aug-25

    The handwritten document was created in connection with Arnold O. Beckman's consulting work for Lee de Forest.