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Clocks and Watches
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Categories
Collector Resources (65)
Promotional Clocks and Watches (5)
Shopping, Antique Clocks and Watches (170)
Shopping, New Clocks (119)
Shopping, New Watches (215)
Web Pages
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  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.
  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.
  How Stuff Works: Atomic Clock http://www.howstuffworks.com/atomic-clock.htm
Concise history, background, definitions and operational information regarding atomic clocks.
  Biological Clocks Virtual Museum 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.
  Doug's Atomic Clocks http://www.niceties.com/atomic.html
Details on Doug Hogarth's experiments with his atomic clock.
  Green Tyme 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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