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Cesium Atomic Clocks Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them. Doug's Atomic Clocks Details on Doug Hogarth's experiments with his atomic clock. 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.

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