Θ Reference: Time: Clocks_and

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See also:

Site list:

How Stuff Works: Atomic Clock Concise history, background, definitions and operational information regarding atomic clocks.
How Stuff Works: Pendulum Clock Concise description using drawings and animation to show the operation of a pendulum clock.
Smithsonian Institute - On Time History of the clock and how Americans have measured time and been affected by it.
Cesium Atomic Clocks Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.

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