Reference: Time: Clocks_and_Watches:

See also:

• Business: Business Services: Supplies and Equipment: Time Recording and Management  (93)
• Computers: Software: Accounting: Time Tracking  (110)
• Computers: Software: Human Resources: Time Keeping Systems  (53)
• Science: Astronomy: Calendars and Timekeeping  (55)

» Biological Clocks Virtual Museum - This exhibit explores the inputs, outputs, and mechanisms of biological clocks with a primary focus on circadian rhythms.




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




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




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




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




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




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

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