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    • 1954-Nov-24

    This letter was written in response to Arnold O. Beckman's congratulations to Linus Pauling upon winning the Nobel Prize in Chemistry.

    • Bulletin 79
    • 1941-May-20

    This report is not an instruction manual, but instead an overview of the (DU) photoelectric quartz spectrophotometer, containing descriptions of its components and specifications.

    The first Beckman Instruments DU…

    • 1935 – 1940

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

    • 1935 – 1940

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

    • 1935 – 1940

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

    • Bulletin No. 17
    • 1935 – 1940

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

    • 1935 – 1940

    The quinhydrone electrode in this instrument was an alternative to Beckman's glass electrode. Quinhydrone electrodes are not reliable at measuring a pH greater than 8, at measuring solutions with strong oxidizing or…

    • Bulletin 16
    • 1939

    The brochure details the components and specifications of the Model R pH meter, manufactured by National Technical Laboratories and branded as a "Beckman pH Meter."

    Arnold Beckman invented his first pH meter in 1934 at…

    • 1927-Dec-12

    Portrait of Dr. Arthur A. Noyes (1866-1936) posed in the doorway of the Chemical Library of the Gates Chemical Laboratory at the California Institute of Technology in Pasadena, California. Per notations accompanying the…

    • 1936-Aug

    This report outlines the colorimetric and electrical ways to determine the pH of a solution and the various kinds of electrodes that can be used with electrical instruments. Beckman concludes that a method using glass…

    • 1939-Oct

    Written by NTL (the precursor to Beckman Instruments, Inc.), this document outlines new standards for buffer solutions used in pH meters.

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

    • Dwg. No. 293-000239
    • 1935-Oct-11

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

    • 1939-Dec
    • 1940
    • 1938-Dec

    The series of photographs depicts employees of National Technical Laboratories.

    • 1983
    • Undated

    The color photographs depict an instrument owned by Jack Kertzman of Perma Pure Products. Kertzman apparently purchased the Model P oxygen meter from an Exxon surplus sale, used it for many years in his laboratory, and…

    • 1944-Jul-27

    The letter regards the development of Models K and L oxygen meters, recommendations for which are ready for further testing by the National Defense Research Committee, and a note that some are unsuitable due to…

    • 1950
    • 1940
    • 1934 – 1935
    • 1946
    • Undated
    • 1949

    A Pasadena garage was the first home of the National Postal Meter Company, founded by Arnold Beckman in 1934. The company soon became National Technical Laboratories, with a focus on pH meters. In 1935, the company…

    • circa 1940 – circa 1979

    Though the photo set is identified as Beckman with "employees," some of the photographs depict ceremonies and visits to non-corporate locations, like CalTech. Some photographs are attributed, dated (1941, 1962, 1967),…

    • 1937-Aug-26

    In this letter, Evans discusses a new electrode design for use in Beckman pH meters.

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

    • 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…

    • 1945-Jun-05

    Linus Pauling's oxygen meter was developed as a military project and the details were classified. In this letter, Pauling requested permission to discuss the oxygen meter at a Caltech seminar. He also states a desire to…

    • 1964-May

    Arnold Beckman, flanked by two unidentified men, receiving the City of Pasadena's Arthur Noble Civics Medal.

    • 1930s

    This garage was the first location of the National Inking Appliance Company, founded by the National Postal Meter Company in 1934 to manufacture the new, nonclogging inking device invented by Arnold O. Beckman. This…

    • 1937-Aug-19

    Evans writes to Beckman while he is on a trip to New York City about advertising and production of the new pH meter, especially the Model M.

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

    • 1935-Sep-07

    Anderson writes from National Technical Labatories to Arnold Beckman, providing him with an update about "acidimeter" production and pre-sales interest while Beckman is away in New York City. He notes that the first…