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Clocks and Watches

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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.

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.

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.

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.

Smithsonian Institute - On Time - http://americanhistory.si.edu/ontime/ History of the clock and how Americans have measured time and been affected by it.

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