File:USNO rubidium fountain.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	06:54, 4 September 2010		250 × 282 (20 KB)	Coenen	{{Information \|Description={{en\|1=Rubidium (Rb) fountain atomic clock at the U.S. Naval Observatory}} \|Source=U.S. Naval Observatory \|Author=U.S. Naval Observatory \|Date= \|Permission= \|other_versions= }} For description, see http://www.skyandtelescope.com

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