| Directory > Reference > Time > Horology Pocket Horology
National chapter of the NAWCC dedicated to collaborative research on the history and horology of
pocket watches.
http://www.pockethorology.org/
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Leap Year Calculation for Year 2000
A response to a VMS problem report giving a detailed explanation of why 2000 is a leap year.
http://h71000.www7.hp.com/openvms/products/year-2000/leap.html
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Clock a History
A brief history of time keeping. How mankind has used the sun, water, candles, sand, pendulums,
springs, electronics, tuning forks, and quartz crystals, to tell time.
http://www.ernie.cummings.net/clock.htm
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Layman's Guide to the Gent's Electric Turret Clock
A Layman's Guide to the working and restoration of a Gent's Pulsynetic Waiting Train Electric
Pendulum Turret Clock.
http://mysite.freeserve.com/waitingtrain/index.jhtml
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UNITAS Reference Site
UNITAS wristwatch and pocketwatch movements from 1898 to the present.
http://www.unitas.netfirms.com
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R.A. Braithwaite
Educational site Elliott clocks, how they are built and how to look after them.
http://www.braithwaitesjewellers.co.uk
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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.
http://mysite.freeserve.com/Pulsynetic
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Clocks and Time
Horological index for organizations, clock and watch museums, related software, mailing lists and
links. Maintained by Gordon T. Uber.
http://www.ubr.com/clocks/
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Lincolnshire Branch of the British Horological Institute
News, events, activities and general information maintained by BHI members.
http://homepage.ntlworld.com/heather.hobden1/lincsbhi.htm
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24 hour analog clocks
The 24 hour analog clock and watch site. All about the 24 hour analog dials. History, software,
even the places to find them.
http://www.cam.net.uk/home/pb/index.html
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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.
http://pages.zoom.co.uk/cosmicelk/hamptoncourtclock.htm
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Daylight Saving Time
History of daylight saving time and how we use it to save energy.
http://webexhibits.org/daylightsaving/
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David Knight - Watchmaker from UK
Articles and pictures of the first two watches made by David Knight. Rich artistic pictures.
http://www.midknight.fsnet.co.uk/david.html
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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.
http://www.abbeyclock.com/
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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.
http://home.rochester.rr.com/kjmpage/clockshistory.html
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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.
http://www.my-time-machines.net
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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.
http://www.ateliera.dk/olsen.htm
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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.
http://www.allanstime.com/AllanVariance/
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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.
http://www.clockmaker.co.uk
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The Bones of Time
Extensively describes the relationship between time, gravitation and energy. Detailed experiments
to demonstrate the concepts are included.
http://www.geocities.com/thebonesoftime/
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Towerclocks.org - Towerclocks in the World
Descriptions, photos and history of tower clocks in the world (English, Español, Português).
http://www.towerclocks.org
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Online Clock Building
Watch a master clockmaker building a clock movement from scratch. Hundreds of photos and drawings,
plus a complete description of the process and CAD plans.
http://www.onlineclockbuilding.com
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"Orologio" at the St. Mark's Square Tower, Venice - Antica Orologeria Zamberlan
Website of Antica Orologeria Zamberlan, Italy. Extensive technical and historical explanation of
the restoration and controversy of the "Orologio" Tower at St. Mark's Square, Venice.
http://www.orologeria.com/english/tower/index.htm
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Louis Essen
Autobiography of the physicist who built the world's first operational atomic clock.
http://www.btinternet.com/~time.lord/
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How The Days of the Week Got Their Names
A short history of the week and each day of the week.
http://www.indepthinfo.com/weekdays/index.shtml
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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.
http://americanhistory.si.edu/ontime/
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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.
http://www.howstuffworks.com/time.htm
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Leap Year Frequently Argued Questions
A humorous approach towards explaining the nature of leap years, in particular why 2000 is a leap
year.
http://world.std.com/%7Edpbsmith/leapyearfaq.txt
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Antique Horology
The Horological Foundation's directory of web sites for watches, clocks, instruments and
barometers.
http://www.antique-horology.org/
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Horology - A Great Hobby
A very basic introduction to how electric clocks work, with animated pictures. Also a collection
of cheap electric clocks with pictures and descriptions.
http://home.clara.net/steve.thackery/clocks/horindex.htm
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Horology.com
Horology is the science of time, timekeeping and timekeepers. Organized collection of links to
horological websites globally.
http://www.horology.com/
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