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(formerly Encyclopedic directory) Clocks and Watches
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Atomic

The general meaning of "atomic" is "irreducible". That is, reduced to the smallest possible part. It has more specific meanings in several contexts:

In chemistry, chemical atoms are grouped by type in the periodic table and consist of particles as described by particle physics.
In computer science, an atomic operation is one that cannot be subdivided. Or more specifically, an operation that always completes as a whole, or doesn't complete at all. See atomic (computer science).

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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

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

Smithsonian Institute - The Quartz Watch
History of the wristwatch, and a description of current technology.
http://www.si.edu/lemelson/Quartz/answer/answer.html

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