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    • The Precious New Pearl
    • circa 1450 – 1480

    This is one of only six known complete manuscripts of a 14th-century alchemical treatise; all the extant manuscripts date from the 15th century or later. This copy includes lengthy contemporary glosses, possibly…

    • circa 1520 – 1540

    Found in its original plain binding of parchment, this work was most likely compiled by a practitioner of alchemy and medicine. Containing a handwritten copy of Liber lucis by John of Rupescissa (Johannes de Rupescissa)…

    • Praeparatio Mercurii ad Lapidem per Regulu/am ♂ [Martis] ✱tum [Stellatum] et Lunam, ex MSS. Phi Americani
    • after 1670 – before 1678

    The manuscript—"On the Preparation of the [Sophick] Mercury for the [Philosophers'] stone by means of the stellate regulus of Mars [i.e. iron] and Luna [i.e. silver] from the Manuscripts of the American Philosopher"—was…

    • 1787-May-07

    Manuscript letter from Marsilio Landriani (1751-1815), chemist, physicist and meteorologist, to a naturalist. Written on May 7, 1787, the letter deals with several topics including the work of Lavoisier, Guyton de…

    • 1812-Aug-16

    Letter in French from Giovanni Antonio Giobert (1761-1834), an Italian chemist and mineralogist after whom the mineral giobertite has been named, to Count Chanteloup. Dated August 16, 1812, the letter concerns a sample…

    • 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

    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…

    • 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

    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

    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

    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 field of…

    • 1854 – 1855

    Notebook containing 49 pages of laboratory notes taken by Charles F. Chandler in Göttingen as a pupil of Professor Friedrich Wöhler in 1854 and in Berlin as a pupil of Professor Heinrich Rose in 1855. In these pages,…

    • 1891 – 1893

    Letter copying book containing accounting reports and business correspondence of Herbert H. Dow as head of the Midland Chemical Company, 1891-1893. The Midland Chemical Company was Dow's second commercial venture, and…

    • 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…

    • 1931-Aug-25

    The handwritten document was created in connection with Arnold O. Beckman's consulting work for Lee de Forest.

    • 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…

    • 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…

    • 1944-Jun-30
    • 1952-Feb
    • 1953-May

    The included reports are "The Pauling Oxygen Meter" by Reuben E. Wood and David P. Shoemaker, 1944; "Final Report Contract Nonr 388(00): Research Covering Develpment of an Onoxia Warning Device for Use in High-altitude…

    • 1946-Apr-08

    Handwritten and -drawn notes detail the resistors used in the Model F pH meter.

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

    • 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-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.

    • Remarks by Edwin P. Arthur before the Los Angeles Section of the American Ceramic Society March 9, 1955
    • 1955-Mar-09

    In his address to the American Ceramic Society, Edwin Arthur discussed the importance of pH--and, by extension, the measurement of pH with Beckman instruments--in the work of ceramists.

    Arnold Beckman invented his…

    • 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…