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Genre Business correspondence Remove constraint Genre: Business correspondence Language English Remove constraint Language: English Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable Remove constraint Rights: In Copyright - Rights-holder(s) Unlocatable or Unidentifiable

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    • 1931-Jul-15

    In this letter, Lee de Forest requests a referral to a chemist who might help electroplate film.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…

    • 1931-Jul-18

    Arnold O. Beckman, then an assistant professor of chemistry at Caltech, offers his assistance as a consulting chemist.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early…

    • 1931-Sep-09

    The letter requests deliverables of 100 feet of silvered film, and two 10 foot pieces with a silver coating on emulsion film and clear stock.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

    • 1931-Oct-09

    The letter discusses the "very nice results" of using new Eastman film and queries as to the possible effects of light upon silvering solution.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum…

    • 1931-Oct-22

    De Forest inquires about Beckman's progress toward a chemical coating that might change in opacity or color, and details the "very fine and uniform quality" of silver coated film de Forest is able to produce.

    Lee de…

    • 1931-Nov-09

    In this letter, de Forest proposes a process that could replace halftone film.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial business ventures…

    • 1931-Aug-20

    Arnold O. Beckman applied (ultimately unsuccessfully) for a job at E. I. du Pont de Nemours and Company. The letter includes details of his work experience, publications, and educational background, including a…

    • 1934-May-10

    In this letter, de Forest discusses the possibility of using chemicals to fight forest fires.

    Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial…

    • 1934-May-28

    Arnold O. Beckman provides an overview of the vacuum film-coating process developed for Lee de Forest. The process successfully coated film with magnesium, lead, bismuth, aluminum, and silver. The letter is apparently…

    • 1935-May-31

    The contract outlines details (including salary, confidentiality, and intellectual property rights) of Howard Cary's work for Arnold Beckman.

    Howard Cary (1908-1991) was a Caltech-educated engineer who joined National…

    • 1935-May-31

    Lyons gives Beckman advice about personnel decisions and discusses early sales of the "acidimeter."

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began…

    • 1935-Jun-03

    Though unsigned, context indicates that this letter was written by Beckman.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH meter in 1934 and thus began a long career…

    • 1935-Jun-23

    This letter includes discussion of personnel issues and policies. Lyons expresses approval for the "Beckman Acidimeter" name.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH…

    • 1935-Aug-29

    Regarding Beckman's business travels to meet with a potential acidimeter distributor, A. S. Aloe Co., and Drs. Ball and Rodewald at the Washington University in St. Louis.

    Dr. Arnold O. Beckman (1900-2004) invented the…

    • 1935-Aug-29

    Regarding Beckman's business travels to meet with two potential acidimeter distributors, Central Scientific Co. and Sargent Co.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH…

    • 1935-Sep-30

    The letter discusses shipment of wheat germ, expenses; demonstrations of the acidimeter at the Pennsylvania General Hospital, University of Pennsylvania, the Department of Agriculture, and the Bureau of Standards;…

    • 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…

    • 1935-Aug-14

    From an unknown author at the Braun Corporation (and carbon copied to its president, J.A. Hartley). The author wants Aldoph Coors (the brewing magnate) to meet Arnold O. Beckman during Beckman's trip to promote his new…

    • 1935-Jun-23

    In this letter, Beckman discusses acidimeter production, personnel issues, patent applications, and the naming of the instrument.

    Dr. Arnold O. Beckman (1900-2004) invented the first commercially successful electric pH…

    • 1936-Jul-02

    Lee de Forest discusses testing Beckman's film-coating process with antimony. A sample of antimony paper is included.