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MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Pasadena in Los Angeles County, California — The American West (Pacific Coastal)
 

Beckman pH Meter

National Historic Chemical Landmark - 1934

 
 
Beckman pH Meter Marker image. Click for full size.
By Craig Baker, September 29, 2018
1. Beckman pH Meter Marker
Inscription. Arnold O. Beckman developed the first commercially successful electronic pH meter while a member of the faculty of the California Institute of Technology. This rugged and portable “acidimeter,” which had all necessary components housed in a single unit, allowed scientists to measure acidity accurately and rapidly. It immediately met an important need of the California citrus industry: how to measure the pH of lemon juice. The innovative features of the pH meter, including an early use of integrated electronic technology, were the basis for subsequent modern instrumentation developed by Beckman and Beckman Instruments.
 
Erected 2004 by American Chemical Society.
 
Location. 34° 8.352′ N, 118° 7.583′ W. Marker is in Pasadena, California, in Los Angeles County. Touch for map. Located on the Cal Tech campus, at the Beckman Institute building, west of Beckman Auditorium. Marker is at or near this postal address: 1200 E California Boulevard, Pasadena CA 91125, United States of America.
 
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. Iris Garden (about 500 feet away, measured in a direct line); Throop Memorial Garden (approx. 0.2 miles away); The First Known Antiparticle
Beckman pH Meter Marker image. Click for full size.
By Craig Baker, September 29, 2018
2. Beckman pH Meter Marker
In the background is the Polyhedron fountain.
(approx. 0.2 miles away); Pacific Asia Museum (approx. one mile away); Camellia Japonica ‘California’ (approx. 1.1 miles away); Pasadena Robinson Memorial (approx. 1.2 miles away); Brainard Alley (approx. 1.3 miles away); Plotkin Alley (approx. 1.4 miles away). Touch for a list and map of all markers in Pasadena.
 
Categories. EducationScience & Medicine
 
Polyhedron with 432 Symmetry image. Click for full size.
By Craig Baker, September 29, 2018
3. Polyhedron with 432 Symmetry
Marker Text: The polyhedron in the fountain is a snub cube, an Archimedean semi-regular solid derived from a cube, with all its edges of equal length. This shape was chosen for the central fountain in the Beckman Institute because it mimics the symmetry of the iron storage protein ferritin, which has 24 identical protein subunits arranged in 432 symmetry about a core of perhaps 4500 iron atoms in the form of a hydrated ferric hydroxyphosphate. The snub cube has 38 faces and 24 vertices, the vertices then representing the subunits of ferritin.
Beckman Auditorium image. Click for full size.
By Craig Baker, September 29, 2018
4. Beckman Auditorium
 
 
Credits. This page was last revised on October 3, 2018. This page originally submitted on October 2, 2018, by Craig Baker of Sylmar, California. This page has been viewed 28 times since then. Photos:   1, 2, 3, 4. submitted on October 2, 2018, by Craig Baker of Sylmar, California. • Andrew Ruppenstein was the editor who published this page.
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