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File:USNO rubidium fountain.jpg

USNO_rubidium_fountain.jpg(250 × 282 pixels, file size: 20 KB, MIME type: image/jpeg)


English: Rubidium (Rb) fountain atomic clock at the U.S. Naval Observatory
Source U.S. Naval Observatory
Author U.S. Naval Observatory

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Public domain This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
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