File:USNO rubidium fountain.jpg

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

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Summary

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

For description, see http://www.skyandtelescope.com/community/skyblog/newsblog/36234159.html

Licensing

	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.
	This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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Rubidium

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