Image:UofI selenium cell photometer mount refractor 1910.jpg
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UofI_selenium_cell_photometer_mount_refractor_1910.jpg (23KB, MIME type: image/jpeg)
This article or image contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website and NPS copyright policy for more information.
Source: National Park Service
Author: Dr. John Dickel, 1910
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- (del) (cur) 01:57, 3 November 2006 . . A mcmurray (Talk | contribs) . . 350×441 (23,488 bytes) ({{PD-USGov-Interior-NPS}} Source: National Park Service Author: Dr. John Dickel, 1910)
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