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2. List of atomic clocks - Wikipedia

   en.wikipedia.org/wiki/List_of_atomic_clocks

   This is a list of some experimental laboratory atomic clocks worldwide. This list is incomplete; you can help by adding missing items. (March 2013) Name

3. Atomic clock - Wikipedia

   en.wikipedia.org/wiki/Atomic_clock

   A caesium atomic clock from 1975 (upper unit) and battery backup (lower unit) [15] In 1949, Alfred Kastler and Jean Brossel ... List of atomic clocks; Network Time ...

4. History of timekeeping devices - Wikipedia

   en.wikipedia.org/wiki/History_of_timekeeping_devices

   The caesium atomic clock maintained by NIST is accurate to 30 billionths of a second per year. [206] Atomic clocks have employed other elements, such as hydrogen and rubidium vapor, offering greater stability (in the case of hydrogen clocks) and smaller size, lower power consumption, and thus lower cost (in the case of rubidium clocks). [206]

5. Category:Atomic clocks - Wikipedia

   en.wikipedia.org/wiki/Category:Atomic_clocks

   Pages in category "Atomic clocks" The following 18 pages are in this category, out of 18 total. This list may not reflect recent changes. ...

6. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

7. NIST-F1 - Wikipedia

   en.wikipedia.org/wiki/NIST-F1

   NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed by Steve Jefferts and Dawn Meekhof of the Time and ...