Search Results

• 
  Business correspondence

  Letter from Glenn Joseph to Arnold O. Beckman

  • 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…

  • Addressee Beckman, Arnold O.
  • Author Joseph, Glenn
  • Subject Electrodes, Hydrogen-ion concentration--Measurement--Instruments, Sunkist Growers, inc., Scientific apparatus and instruments, Hydrochloric acid, Electrodes, Glass, Scientific apparatus and instruments--Design and construction, California Fruit Growers Exchange, Beckman Instruments, Inc.
• 
  Business correspondence

  Letter from Glenn Joseph to Arnold O. Beckman

  • 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…

  • Addressee Beckman, Arnold O.
  • Author Joseph, Glenn
  • Subject Electrodes, Hydrogen-ion concentration--Measurement--Instruments, Sunkist Growers, inc., Scientific apparatus and instruments, Electrodes, Glass, Scientific apparatus and instruments--Design and construction, Amplifiers, Vacuum-tube, California Fruit Growers Exchange, Beckman Instruments, Inc.
• 
  Manuscripts, Charts, diagrams, etc

  Calibration of a McLeod Gauge

  • 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…

  • Subject Pressure gages, Numerical calculations, Scientific apparatus and instruments--Calibration, Scientific apparatus and instruments
• 
  Photographs, Portraits

  Portrait of John Van Nostrand Dorr (1872-1962)

  • 1930s

  Portrait of John Van Nostrand Dorr (1872-1962). In partnership with John Lundberg and A.D. Wilson, Van Nostrand Dorr owned the Lundberg, Dorr, & Wilson gold & silver mining operation in Terry, South Dakota. In 1916, he…

  • Subject Chemical engineering, Chemists, Portraits, Chemical engineers, Industrialists, Dorr, John Van Nostrand, 1872-1962
• 
  Photographs, Portraits

  Portrait of Leo Hendrik Baekeland (1863-1944)

  • After 1920 – 1944

  Portrait of Leo Hendrik Baekeland (1863-1944), inventor of Bakelite, the first fully synthetic plastic.

  • Manufacturer Underwood & Underwood
  • Subject Portrait photography, Inventors, Bakelite, Baekeland, L. H. (Leo Hendrik), 1863-1944, Plastics
• 
  Photographs, Portraits

  Portrait of Carroll A. Hochwalt (1900-1987)

  • 1930s

  Portrait of Carroll A. Hochwalt (1900-1987). Hochwalt worked as a chemical engineer for the General Motors Corporation before co-founding Thomas & Hochwalt Laboratories in partnership with Charles Allen Thomas in 1926.…

  • Subject Portrait photography, Hochwalt, Carroll A., 1900-1987, Portraits, Chemical engineers, Monsanto Chemical Company
• 
  Engravings, Prints, Portraits

  Professor Wohler

  • After 1840 – before 1940

  A half-length portrait of Friedrich Wöhler (1800–1882), a German chemist.

  • Artist Cook, Conrad
  • After L'Allemand, Conrad, 1809-1880
  • Subject Wöhler, Friedrich, 1800-1882