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Creator Beckman, Arnold O. Remove constraint Creator: Beckman, Arnold O. 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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    • 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-Aug-25

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

    • 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

    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-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.

    • circa 1936

    The receipt lists materials the De Forest Television Corporation received from Arnold O. Beckman. The memorandum concerns work Beckman performed for the American Television Corporation, the De Forest Television…

    • 1936-Oct-09

    Lee de Forest states that he has "temporarily become disassociated from the activities of De Forest Television Corporation" and advises Beckman to retain any equipment currently in his possession.

    Lee de Forest…

    • 1936-Nov-10

    Lee de Forest states that he returned from a trip to Chicago to find his company in financial disarray. He regrets that Beckman's contracted work was continued, despite an inability to pay for it, and assures him that…

    • 1937-Aug-17

    The letter discusses Beckman's scheduled meetings, marketing strategies for the pH meter, and interest in postal meters.

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the…

    • 1937-Aug-21

    The letter was written during a multi-city trip, most likely in Pittsburgh or New York. Beckman discusses the cases of the instruments, and his desire to replace metal cases with wood; pricing of the instruments; and…

    • 1937-Aug-25

    This letter, written while Arnold Beckman was on a multi-city trip promoting his pH meter, concerns strategies for marketing the instruments and concern about the friction between a salesman and distributor.

    Arnold…