Knowledge: clocks and watches
See Also:
- business → business services → supplies and equipment → time recording and management
- computers → software → accounting → time tracking
- computers → software → human resources → time keeping systems
- science → astronomy → calendars and timekeeping
Links
- 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.
- Doug's Atomic Clocks
http://www.niceties.com/atomic.html - Details on Doug Hogarth's experiments with his atomic 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.
- 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.
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