Abbey Clock Clinic - Mark Headrick's Horology Page - Traditional horology website with information and mantainance tips. Technical descriptions and troubleshooting of escapements. Grandfather clocks, wall clocks, and watches.
Allan Variance -- Overview by David W. Allan - Core algorithm of international time scale has multiple metrology applications, from atomic clock frequency characterization to definition of the meter. Equation, explanation and publications.
Antique Horology - The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
Clocks and Time - Horological index for organizations, clock and watch museums, related software, mailing lists and links. Maintained by Gordon T. Uber.
Cumbria Clock Company - Company specialized in all aspects of work connected with church clocks, public clocks, and tower clocks which includes the full historical restoration of antique clock movements.
Hampton Court Clock - The story of the famous Astronomical clock at Hampton Court Palace. By the author of the original official guide books with the extra omitted information.
The History of Clocks and Watches - Learn about the history of clocks and watches, and discover the evolution of timekeeping devices from the first primitive sundials to the ultramodern atomic clocks. Includes a timeline.
The Horology Source - Gateway to all aspects of clocks, watches, timekeeping, and the science of horology.
Horology.com - Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
24 hour analog clocks - The 24 hour analog clock and watch site. History, software, and the places to find clocks with 24 h dials.
How Stuff Works: Time - Complete five-part explanation of time and how it is measured, including information about clocks, time zones, calendars, BC and AD.
Jens Olsen's Astronomical Clock - Description of the restoration of Jens Olsen's Astronomical Clock, a masterpiece in Copenhagen City Hall that consists of 15.448 individual parts.
Louis Essen - Autobiography of the physicist who built the world's first operational atomic clock.
Mark Frank's Home Page - Website showing the restoration of a french flat bed tower clock in great detail, step by step, as well as other information and links of tower clock sites.
On Time - The Smithsonian Institute's exhibition on the changing ways we have measured, used, and thought about time over the past three hundred years.
Pocket Horology - National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.
Pulsynetic Electric Clocks - Description, pictures and diagrams of many of the horological products made before 1945 By Gent's of Leicester GB, including a rare Observatory controlled transmitter.
UNITAS Reference Site - UNITAS wristwatch and pocketwatch movements from 1898 to the present.
