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  Time: Clocks and Watches

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Clocks and Watches (Subscribe)

Links

Smithsonian Institute - On Time popular

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

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

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How Stuff Works: Pendulum Clock popular

http://www.howstuffworks.com/clock.htm

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

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How Stuff Works: Atomic Clock popular

http://www.howstuffworks.com/atomic-clock.htm

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

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Green Tyme popular

http://gtyme.org/

Using a patented KinderClock Chronichron, this site simultaneously displays both standard time's fixed hours and natural time's variable lengths of days and nights.

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Doug's Atomic Clocks popular

http://www.niceties.com/atomic.html

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

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Cesium Atomic Clocks popular

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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Biological Clocks Virtual Museum popular

http://www.hhmi.org/biointeractive/clocks/museum.html

This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.

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