Clock

A clock is an instrument used to indicate, keep, and co-ordinate time. The word clock is derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece. In general usage today a "clock" refers to any device for measuring and displaying the time. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.

The clock is one of the oldest human inventions, meeting the need to consistently measure intervals of time shorter than the natural units: the day; the lunar month; and the year. Devices operating on several different physical processes have been used over the millennia, culminating in the clocks of today.

The study of timekeeping is known as horology.

Read more about Clock:  Sundials and Other Devices, Water Clocks, Early Mechanical Clocks, How Clocks Work, Types, Purposes, Seismology, Specific Types of Clocks

Famous quotes containing the word clock:

    A junky runs on junk time. When his junk is cut off, the clock runs down and stops. All he can do is hang on and wait for non-junk time to start.
    William Burroughs (b. 1914)

    The source of poetry that
    seeing the clock stopped, says,
    The clock has stopped

    that ticked yesterday so well?
    William Carlos Williams (1883–1963)

    Stands the Church clock at ten to three?
    And is there honey still for tea?
    Rupert Brooke (1887–1915)