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Smart Dir : free sites directory. Reference Time Clocks and Watches. Directory of Reference Time Clocks and Watches.

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See also:

    http://www.hhmi.org/biointeractive/clocks/museum.html   » Biological Clocks Virtual Museum - This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.

    http://tycho.usno.navy.mil/cesium.html   » Cesium Atomic Clocks - Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.

    http://www.niceties.com/atomic.html   » Doug's Atomic Clocks - Details on Doug Hogarth's experiments with his atomic clock.

    http://www.howstuffworks.com/atomic-clock.htm   » How Stuff Works: Atomic Clock - Concise history, background, definitions and operational information regarding atomic clocks.

    http://www.howstuffworks.com/clock.htm   » How Stuff Works: Pendulum Clock - Concise description using drawings and animation to show the operation of a pendulum clock.

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

    http://www.watchsourceguide.com   » Watch Source Guide - Comprehensive source of information about watches. Includes sections on watch functioning, maintenance, articles and more.

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