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Digital Collections

Photographs

Beckman Models 940 and 941 pH Analyzer

  • Undated

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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 instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry.

Property Value
Photographer
Format
Genre
Extent
  • 5 in. W x 4 in. L
Inscription
  • (right front) "Armstrong/Hess 2069-3. Model 940/941 pH Anal."
  • (verso) "Armstrong + Hess. 2220 East Howell Avenue, Anaheim, California 92805. Norman Armstrong - W. J. Hess. Professional Photography. 2069-3. Bus. Phone (714) 532-4424. Res. Phone: (714) 772-3427."
Subject
Rights In Copyright - Rights-holder(s) Unlocatable or Unidentifiable
Credit line
  • Courtesy of Science History Institute

Institutional location

Department
Collection
Series arrangement
  • Series X. Photographic Materials
  • Sub-series 3. Photo Albums
Physical container
  • Box 84

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Related Items

Cite as

Armstrong & Hess. “Beckman Models 940 and 941 PH Analyzer,” n.d. Beckman Historical Collection, Box 84. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/kd17ct13d.

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