File:Ammonia Clock Smithsonian.JPG
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Photograph of the NBS Ammonia Clock designed by Lyons when on exhibit at the Smithsonian Museum in Washington, DC.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:01, 22 February 2016 | | 1,024 × 1,536 (552 KB) | Mlombardi (talk | contribs) | Photograph of the NBS Ammonia Clock designed by Lyons when on exhibit at the Smithsonian Museum in Washington, DC. |
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