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    • 1834

    Lecture notes recorded by Jean-Baptiste-Alexandre Stroehlin in Paris when he attended lectures given by Matthieu Orfila. The lectures are organized around specific chemicals, thus there are headings such as "Carbonates"…

    • after 1849 – before 1895

    Second page of handwritten lecture notes with diagrams prepared by Louis Pasteur for a lecture to the National Academy of Medicine on the subject of crystal structures, tartaric acid, and arsenites. This work led to the…

    • after 1849 – before 1895

    First page of handwritten lecture notes with diagrams prepared by Louis Pasteur for a lecture to the National Academy of Medicine on the subject of crystal structures, tartaric acid, and arsenites. This work led to the…

    • after 1849 – before 1895

    Fourth page of handwritten lecture notes with diagrams prepared by Louis Pasteur for a lecture to the National Academy of Medicine on the subject of crystal structures, tartaric acid, and arsenites. This work led to the…

    • after 1849 – before 1895

    Third page of handwritten lecture notes with diagrams prepared by Louis Pasteur for a lecture to the National Academy of Medicine on the subject of crystal structures, tartaric acid, and arsenites. This work led to the…

    • 1930s

    The McLeod Gauge measures very low pressures of gasses. Its presence in this collection indicates that it was used during the production of Beckman Instruments' early pH meters. These calibrations may have been written…

    • 1934-Mar-22

    These calibrations and the diagram were done by W. E. Baier, Research Manager of the California Fruit Growers' Exchange. The McLeod Gauge measures very low pressures of gasses. Its presence in this collection indicates…

    • Undated

    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…

    • 1980

    These handwritten notes (by an unidentified author) detail the process by which Linus Pauling came to National Technical Laboratories to produce his oxygen meter design and how this lead to the formation of Arnold O.…