Reference, Time, Clocks and Watches

Clocks and Watches

5 Sites in Clocks and Watches

Cesium Atomic Clocks

Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.

http://tycho.usno.navy.mil/cesium.html
Doug's Atomic Clocks

Details on Doug Hogarth's experiments with his atomic clock.

http://www.niceties.com/atomic.html
How Stuff Works: Atomic Clock

Concise history, background, definitions and operational information regarding atomic clocks.

http://www.howstuffworks.com/atomic-clock.htm
How Stuff Works: Pendulum Clock

Concise description using drawings and animation to show the operation of a pendulum clock.

http://www.howstuffworks.com/clock.htm
Smithsonian Institute - On Time

History of the clock and how Americans have measured time and been affected by it.

http://americanhistory.si.edu/ontime/

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