A clock (from the Latin cloca, "bell") is an instrument for measuring time and for measuring time intervals of less than a day—as opposed to a calendar. Those used for technical purposes, of very high accuracy, are usually called chronometers. A portable clock is called a watch. The clock in its most common modern form (in use since at least the 14th century) displays the hours, minutes and, sometimes, seconds that pass during a twelve- or twenty-four-hour period.
The clock is one of the oldest human inventions, requiring a physical process that will proceed at a known rate and a way to gauge how long that process has run. As the seasons and the phases of the moon can be used to measure the passage of longer periods of time, shorter processes had to be used to measure off hours and minutes. The sundial, which measures the time of day by the direction of shadows cast by the sun, was widely known in ancient times.
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Horology :: Technology
Time :: Reference
Clocks and Watches :: Antiques and Collectibles
Clocks :: Accessories
Estate and Collectible Jewelry
Watches

Antique Horology - The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
Meta Description: [ The Horological Foundation's directory for Antique Clocks, Antique Watches and Antique Barometers ]
Atmos Clocks From Jaeger-LeCoultre - Offering information on dating, history, care and restoration.
Meta Description: [ Complete Restoration and repair of all types of Antique
Clocks including American English, French & German movements; Specializing
in Swiss, Atmospheric Atmos Clocks by Jaeger-LeCoultre. Our services also
include, gold, bronze, brass and silver restoration, including dial and ca... ]
Attleboro Clocks Co. Research - Dedicated to research on antique clocks with Attleboro Clock Co. Attleboro Mass on the dial.
Barrie's Virtual Museum of Clocks - Pictures and information about antique and vintage clocks including grandfather, mantle and wall clocks. Electric and master clocks, time recorders and anything to do with horology.
Meta Description: [ Pictures and information on over 300 antique and vintage clocks in Barrie's Clock Museum ]
ClockHistory.Com - History and information about Westclox, trade name of the Western Clock Manufacturing Company. Important dates, patents, advertisements, catalogs and online ordering of select reproduction replacement parts.
Meta Description: [ Historical information about Westclox and Western Clock Company clocks and watches, Seth Thomas weight clocks and adamantine clocks, and early Telechron and Warren Clock Company clocks and motors. Standard Electric Time Company clocks. ]
Clocks and Time - Horological directory of web sites for organizations, museums for clocks and watches, mailing lists, book reviews and a watch and clock FAQ.
Meta Description: [ Horological site for organizations, museums for clocks, watches. Software for time synchronization and display. Clocks, Clocksmiths and Sundial mailing lists. Reviews, and dealers of books, magazines. Tables of contents. Horological science. ]
Clocks: A Collection - Listing and photographs of clocks in a personal collection.
Horology - A Great Hobby - Basic introduction to how electric clocks work. Hobbyist's collection gallery with animations and related links.
Interstate Time Company - Features a slide show on Collecting Illinois Watches Without Going Broke, and discussion on private labeled Bunn Specials.
Mayfield Books clocks publisher - Horological books
Setclocks - Contains a history of the Standard Electric Time Company, links to various collections with images and several case studies of restorations of school systems.
Sundials by François Blateyron - A web site dedicated to sundials, with pictures and a freeware program to download.
The Astrolabe - The history and uses of the astrolabe, a very ancient astronomical computer for solving problems relating to time and the position of the Sun and stars in the sky.
Meta Description: [ Introduction to the astrolabe. ]
The Clockwork Historian - Specializing in research on the early clockmakers of New England. Has records of tower clock installations for Seth Thomas, E. Howard, Stevens and Schwalbach clock companies.
The Fascination of Old Clocks and Watches - Information and pictures on pocket watches, mantel clocks, carriage clocks, marine chronometers, electric clocks, and wristwatches.
Meta Description: [ alte Uhren, pendules anciennes, old clocks ]
Uk250.co.uk - Antiques Websites - A collection of UK websites for antiques.
Meta Description: [ A splendid collection of UK websites for antiques ]
Vienna Regulators - Includes illustrations and information on styles from 1815-1920 and clocks for sale.
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