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    • 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…

    • Beckman Instructions 334-B
    • 1963-Sep

    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…

    • 1949-Mar-08

    Patent #2,463,743 for a hydrogen tube designed by H. Howard Cary and Warren Baxter during their time at National Technical Labs, a precursor to Beckman Instruments. This tube was designed for use in UV…

    • 378-C
    • 1956-Aug

    The Beckman DK Spectrophotometer was an enhancement of the DU, which expanded the instrument’s range into near-infrared. This was accomplished by chemist Wilbur I. Kaye, who began his work on science behind the DK at…

    • Bulletin 206-B
    • 1949-Jul-12

    The ultraviolet Model B was marketed as an easier to use and more affordable alternative to the Beckman DU Spectrophotometer.

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

    • 1986-Jun-19

    The press release announces a spectrophotometer system for use with DNA analysis.

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

    • 1941-Nov

    The article is reprinted from the Journal of the Optical Society of America Vol. 31, No. 11, November 1941 and was presented at the Ninth Summer Conference on Spectroscopy and Its Applications, held at the Massachusetts…

    • Undated

    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…

    • 355-C
    • 1957-May

    The Beckman DK Spectrophotometer was an enhancement of the DU, which expanded the instrument’s range of into near-infrared. This was accomplished by chemist Wilbur I. Kaye, who began his work on science behind the DK at…

    • 1960

    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…

    • 1960s

    Produced in the 1960s, the DB-G was a single-beam grating (as opposed to a prism) ultraviolet spectrophotometer.

    • 1941-Sep-25

    This advertisement, reprinted from the American Chemical Society News Edition, may be the earliest advertisement for the DU model. The page is stamped Apr 25 1961 (though the date is crossed out) and the reprint note is…

    • 1977-Aug-19

    The photostat document lists the first hundred companies and institutions to use Beckman's quartz spectrophotometers; the original document was undated.

    The first Beckman Instruments DU Spectrophotometer was developed…

    • 1951-Apr-01

    The letter provides an outsider perspective on Beckman Instruments' competition for the DR spectrophotometer's market.

    • 1951-Apr-01

    This letter from S. Feier of Buffalo Apparatus Corporation provides an outsider perspective on competition for Beckman Instruments' DR Spectrophotometer market, with specific mention of the Fisher Spectrocord.

    • 1954-Mar-28

    This series of handwritten and -drawn notes relates to the development of the Beckman DU-X2 spectrophotometer. One of the pages appears to be missing.

    The first Beckman Instruments DU Spectrophotometer was developed in…

    • 1954-Mar-09

    The memorandum discusses a rival company's spectrophotometer, the Warren Spectracord. (Warren Electronics, Inc. would be acquired by Perkin-Elmer in 1956). The Beckman Instruments DR Spectrophotometer is framed as…

    • 1970s

    Beckman's foray into ultraviolet spectroscopy began in 1940, when the company (then called National Technical Laboratories) produced the DU prototype. The double-beam Model 25 was introduced in the early 1970s.

    • Instructions No. 91
    • Undated

    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…

    • or, "Don't Fall For That Speed Stuff"
    • 1954-Apr-16

    The DR was a double-beam ultraviolet spectrophotometer, designed for accuracy rather than speed. Lee Cahn's skit represents an effort to begin "selling accuracy," as noted in the attached memo from J. D. MacNamara. The…

    • 1976-Sep-23

    This press release announcing the discontinuation of the DU spectrophotometer served as a retrospective of the instrument's development and significance.

    The first Beckman Instruments DU Spectrophotometer was developed…

    • 1955-Apr-26

    Hulek, Arnold Beckman's secretary, responds to a letter from Manning requesting the overhaul of a spectrophotometer. She explains that Beckman himself is in Nevada observing an atomic bomb test.