- How Stuff Works: Atomic Clock - http://www.howstuffworks.com/atomic-clock.htm
- Concise history, background, definitions and operational information regarding atomic clocks.
- How Stuff Works: Pendulum Clock - http://www.howstuffworks.com/clock.htm
- Concise description using drawings and animation to show the operation of a pendulum clock.
- Doug's Atomic Clocks - http://www.niceties.com/atomic.html
- Details on Doug Hogarth's experiments with his atomic clock.
- Smithsonian Institute - On Time - http://americanhistory.si.edu/ontime/
- History of the clock and how Americans have measured time and been affected by it.
- Cesium Atomic Clocks - http://tycho.usno.navy.mil/cesium.html
- Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.
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