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Category:Photoelectricity

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A 1913 photoelectric photometer mount on a refractor - Photo by Dr. John Dickel, The National Park Service, and The University of Illinois Observatory
A 1913 photoelectric photometer mount on a refractor - Photo by Dr. John Dickel, The National Park Service, and The University of Illinois Observatory

Pages in category "Photoelectricity"

The following 2 pages are in this category, out of 2 total.

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Media in category "Photoelectricity"

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