Clocks

More on Clocks from Infoplease:

• clock - clock clock, instrument for measuring and indicating time. Predecessors of the clock were the ...
• 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).
• Quartz Clocks - Quartz Clocks The Shortt clock was replaced as the standard by quartz crystal clocks in the 1930s ...
• Water Clocks - Water Clocks Source: National Institute of Standards and Technology Physics Laboratory Water clocks ...