File:Ammonia Clock Smithsonian.jpg
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The NBS Ammonia Clock invented by Lyons when on display in the Smithsonian Museum in Washington, DC.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:09, 22 February 2016 | | 1,024 × 1,536 (552 KB) | Mlombardi (talk | contribs) | The NBS Ammonia Clock invented by Lyons when on display in the Smithsonian Museum in Washington, DC. |
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