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Reference: Time: Alternative Systems
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.
- The Horological Foundation's directory of web sites for watches, clocks, instruments and barometers.
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.
David Knight - Watchmaker from UK
- Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.
Daylight Saving Time
- History of daylight saving time and how we use it to save energy.
Functionning of a Simple Mechanical Watch
- Explanation of the roles of components of a wristwatch.
Horology - The Index
- Horology is the science of time, timekeeping and timekeepers. Organized collection of links to horological websites globally.
How The Days of the Week Got Their Names
- A short history of the week and each day of the week.
Leap Year Calculation for Year 2000
- A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.
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.
National Association of Watch and Clock Collectors
- Organization of watch and clock enthusiasts.
- The Smithsonian Institute's exhibition on the changing ways people have measured, used, and thought about time over the past three hundred years.
- National chapter of the NAWCC dedicated to collaborative research on the history and horology of pocket watches.
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