Encyclopediaclockclock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watch. Sections in this article: The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on clock from Fact Monster:
- atomic clock - atomic clock atomic clock, electric or electronic timekeeping device that is controlled by atomic ...
- Daylight Saving Time - Starting in 2007, "daylight time" will be observed from the second Sunday in March to the first Sunday in November, adding about a month to the current daylight saving time (the first Sunday in April to the last Sunday in October).
- Water Clocks - Water Clocks Source: National Institute of Standards and Technology Physics Laboratory Water clocks ...
- Water Clocks - Water Clocks Source: National Institute of Standards and Technology Physics Laboratory Water clocks ...
- Accurate Mechanical Clocks - Accurate Mechanical Clocks Source: National Institute of Standards and Technology Physics ...
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