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    Instructions and a visual diagram for hooking up 3 #5540 batteries to power a Beckman Model G pH Meter. These three smaller batteries could replace a single, large 22.5 volt battery. This diagram was written on Bob…

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    Advertisement about using various models of Beckman pH meters for monitoring water quality in industrial settings.

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

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    Table of spectrophotometer and pH readings of various substances, including strychnine, caffeine, amphetamine, benadryl, and ascorbic acid. As this document is undated and vaguely titled, it is unclear which instrument…

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    The watermark on the paper indicates that these directions may have been written by the Columbus Water and Chemical Testing Laboratory.

    The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the…

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    Undated notes by an unknown author, although his person was very likely a Beckman Instruments employee.

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

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    The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by employee Howard Cary (who had previously been involved in pH meter…

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    The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by employee Howard Cary (who had previously been involved in pH meter…

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    A cuvette is a clear container for holding liquid samples, usually for use in a spectrophotometer or other instrument. This one is designed specifically for use in blood gas analysis.

    • Personal Recollections of Arnold O. Beckman
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    The account focuses on the early days of Beckman's entrepreneurial endeavors, from Robert Millikan referring I. H. Lyons to Beckman for assistance with National Postal Meter Company inks through the renting of a new…

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    This account of Howard Cary's life covers the period from his birth to his initial contact with National Technology Laboratories and brief discussion of his later involvement with pH meter development. He devotes a fair…

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    The second side of the poster has been cropped into three parts for ease of reading. These particular instruments were manufactured by the E. Vernon Hill Company based in Chicago.

    Psychrometers, also known as…

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    Though the instruction manual is undated, details such as the November 1956 drawing dates provide clues about creation and publication dates.

    Beckman Instruments' analog computers were being produced by their Berkeley…

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    Two lists are included: one identifies companies, the second includes instrument serial numbers and shipping dates. Both documents are copies, and (per a note by Pat Ashton) the detailed list does not mention…

    • Bulletin 110B
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    The Beckman Instruments IR spectrophotometers began as a request from the Office of Rubber Reserve to Arnold O. Beckman in 1942, asking for an infrared spectrophotometer that they could use to create rubber. Under this…

  1. Short description of electron distribution and position in molecules of CO2.

  2. Contains a listing of available benzo color dyes.

    • Bulletin 419
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    Instruction manual for an instrument designed to record levels of oxidants in the atmosphere. Measuring oxidants is one way to quantify air pollution. Photochemical oxidants are air pollutants which form when air…

    • Instructions No. 91
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    This undated draft is handwritten and hand-drawn on yellow paper.

    The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by…

    • Beckman Reprint R-24
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    The paper, distributed as a reprint from Beckman Instruments, described the IR-3 spectrophotometer. It was originally presented before the Symposium on Molecular Structure and Spectroscopy, held in Columbus, Ohio at…

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    Developed from a Linus Pauling design during WWII, the technology behind Beckman Instruments’ oxygen analyzers ended up doing such diverse jobs as monitoring astronauts’ respiration, maintaining packaged food safety,…

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    This glass electrode was first used in Beckman pH meters and later other instruments.

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

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    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 “acidimeter” with its…