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Subject Electrodes, Glass Remove constraint Subject: Electrodes, Glass

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    • Appraisal of competitors electrodes
    • 1954-Apr-15

    The report concerns Beckman's electrode business, with a focus on Leeds & Northrup electrodes which "do not compare too favorably with ours."

    • What is new about L & N electrodes
    • 1955-Aug-15

    The report concerns the business of electrodes, including legally challenging questions about possible patent infringement.

    • No. T-8-(R)
    • 1957-May-23

    The report evaluates the portable OM-1 oxygen meter, deeming it convenient and moderately precise, but sensitive to temperature fluctuations.

    • Dwg. No. 18617
    • 1957-Apr-22

    This oxygen electrode was first used inside Beckman Instruments pH meters and later in many other instruments.

    • Bulletin 69-B
    • 1949-Dec

    Glass electrodes were used in Beckman pH meters and various other instruments.

  1. Self contained pH meter with wooden exterior; hinged lid opens to reveal meter face and inlaid paper instructions for use; the dial is calibrated from pH 0 to pH 13 in .1 pH divisions; porcelain enamel lined electrode…

    • 1956

    Although the author is unknown, these instructions were most likely written by a Beckman Instruments employee. This glass electrode was used in Beckman pH meters.

    Arnold Beckman invented his first pH meter in 1934 at…

    • 1950s

    The advertisement touts the features of Beckman glass electrodes and the company's position in the instrumentation field.

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

    • 1985-Dec-06

    The press release announces the Beckman Futura II Calomel Combination Electrode.

    • 1978-Dec-07

    The kit included buffers, storage solution, rinse, and a storage rack. Beckman oxygen electrodes were first used in their pH meters and later with other instruments.

    • 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…

    • Dwg. No. 11098
    • 1957

    This electrode was first used inside Beckman Instruments pH meters and later in many other instruments.

    • 1954-Sep-26

    These handwritten notes on glass electrodes appear to be signed Noel B. Brayman.

    Glass electrodes were used in Beckman pH meters and various other instruments.

    • 1955-May-10

    The handwritten notes appear to be signed Noel Brayman.

    Glass electrodes were used in Beckman pH meters and various other instruments.

    • Final draft
    • 1955-Feb-25

    The foldering of this document suggests it was written by Edwin Arthur. As in a 1957 document, "beauty" was the first criteria to be evaluated.

    The glass electrodes were used in Beckman pH meters and various other…

    • 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…

    • 1950

    Self contained pH meter with wooden exterior; hinged top door opens to reveal meter face and inlaid paper instructions for use; the dial is calibrated from pH 0 to pH 13 in .1 pH divisions; porcelain enamel lined…

    • circa 1933

    Glenn Joseph writes to Dr. Beckman about the process of finding the right buffer to use in the new glass electrodes inside the pH meter. The identify of the "Dr. Dupont" referenced in this letter is uncertain.

    Arnold…

    • 1934-Jan-09

    This job schedule is a snapshot of the work being done by NTL in January, 1934. This work included the important pH meter development for the California Fruit Growers Exchange, of course, but also a project for Lee de…

    • 1933

    In this letter, Glenn Joseph reports that the vacuum-tube amplifier in the early Beckman pH meter model is (still) not functioning properly. One of the fixes he proposes is replacing the vacuum tubes with a glass…

    • 1934-Jun-22

    This letter spells out the instrument maintenance and upgrades that the California Fruit Growers Exchange believe are included with the cost of developing the "glass electrode apparatus" (an early prototype of the…

    • 1934-Apr-10

    Invoice from Arnold O. Beckman to W. E. Baier
    for developing and calibrating McLeod gauges and glass electrodes -- components involved in the early Beckman pH meter.

    Arnold Beckman invented his first pH meter in 1934…

    • 1934-Jun-19

    A bill sent by Arnold Beckman to W. E. Baier, covering the cost of a "glass-electrode apparatus," which was included in the first Beckman pH meter.

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