Clocks and Watches

» Biological Clocks Virtual Museum
   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

» Cesium Atomic Clocks
   Kinds of cesium clocks, with pictures, plus a description of their operation and the science behind them.

   
   http://tycho.usno.navy.mil/cesium.html

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

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

» How Stuff Works: Atomic Clock
   Concise history, background, definitions and operational information regarding atomic clocks.

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

» How Stuff Works: Pendulum Clock
   Concise description using drawings and animation to show the operation of a pendulum clock.

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

» Smithsonian Institute - On Time
   History of the clock and how Americans have measured time and been affected by it.

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

» Watch Source Guide
   Comprehensive source of information about watches. Includes sections on watch functioning, maintenance, articles and more.

   
   http://www.watchsourceguide.com