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Very accurate clocks can be constructed by locking an electronic oscillator to the frequency of an atomic transition.
A long read about the history of the atomic clocks
A brief description of how atomic clocks work to keep track of time accurately. From HowStuffWorks.com.
A great short article on how atomic clocks work from NPL
A site from the Smithsonian dedicated to exploring the relationship between time and navigation from how sailors needed accurate clocks to determine their longitude to how satellites navigation ...
A brief description of how Pendulum Clocks work. This site is part of Marshall Brain's HowStuffWorks.com. Nice experiment to show how to make and improve pendulum clocks.
How do you measure time? A guided tour of the history of the measurement of time from ancient calendars and sun dials to modern day atomic clocks.
Atmos clocks, invented by Jean-Leon Reutter, have an ingenious design that allows them to "live on air" and never need winding.
Autobiography of Norman F. Ramsey (1915 - ), who received the Nobel Prize for Physics in 1989 for the invention of the separated oscillatory fields method and its use in the hydrogen maser and other ...
A brief description of how Digital Clocks work, and how you can build your own. From HowStuffWorks.com.
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