Reference Time Clocks and Watches
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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