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Creator Beckman, Arnold O. Remove constraint Creator: Beckman, Arnold O. Creator Duschak, L. H. Remove constraint Creator: Duschak, L. H. Format Text Remove constraint Format: Text Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable Remove constraint Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable

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    • 1935-May-03

    Duschak comments on the price of the pH meter (high, but in line with comparable instruments) and inquires whether or not the "acidimeter" could be sold again after his project is finished.

    Arnold Beckman invented his…

    • 1935-Apr-26

    One of the earliest inquiries into using one of Arnold Beckman's newly invented pH meters.

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