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File:UofI selenium cell photometer mount refractor 1910.jpg

UofI_selenium_cell_photometer_mount_refractor_1910.jpg ‎(350 × 441 pixels, file size: 23 KB, MIME type: image/jpeg)

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Description selenium cell photometer mounted on a refractor, 1910, University of Illinois Observatory
Date
Source National Park Service
Author Dr. John Dickel
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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current08:55, 18 August 2010Thumbnail for version as of 08:55, 18 August 2010350 × 441 (23 KB)XIIIfromTOKYO (talk | contribs){{Information |Description=selenium cell photometer mounted on a refractor, 1910, University of Illinois Observatory |Source=National Park Service |Date=1910 |Author=Dr. John Dickel |Permission={{PD-USGov-Interior-NPS}} |other_versions= }} [[Category:Univ

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