File:Ammonia Clock 01061949.jpg
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The world's first atomic clock as it appeared on January 6, 1949, the day of the first public announcement. An ammonia absorption cell consisting of about 8 meters of K-band waveguide is coiled around the 50 Hz electric clock. The clock was there for appearances only, so that the world would know what the device was.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:33, 22 February 2016 | | 2,471 × 3,000 (608 KB) | Mlombardi (talk | contribs) | The world's first atomic clock as it appeared on January 6, 1949, the day of the first public announcement. An ammonia absorption cell consisting of about 8 meters of K-band waveguide is coiled around the 50 Hz electric clock. The clock was there for... |
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