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atomic clock at the NIST, Boulder, Colorado
This photo shows the NIST-F1 cesium atomic clock in Boulder, Colorado.  Atomic clocks operate by using the vibration of cesium or rubidium atoms to set very precise time, and are the standard in timekeeping as they are the most accurate clocks available.  Due to their accuracy, atomic clocks are used for international time distribution services and in GPS systems.
Link to this photograph page:
<a href="http://www.atomicclocks.us/nist-atomic-clock.htm">NIST Atomic Clock</a>
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NIST-F1 Cesium Fountain Atomic Clock Picture