This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.
http://www.hhmi.org/biointeractive/clocks/museum.html - New window - Cached - Archive -
Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.
http://tycho.usno.navy.mil/cesium.html - New window - Cached - Archive -
Concise description using drawings and animation to show the operation of a pendulum clock.
http://www.howstuffworks.com/clock.htm - New window - Cached - Archive -
History of the clock and how Americans have measured time and been affected by it.
http://americanhistory.si.edu/ontime/ - New window - Cached - Archive -
Comprehensive source of information about watches. Includes sections on watch functioning, maintenance, articles and more.
http://www.watchsourceguide.com - New window - Cached - Archive -
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