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 Vintage 1930s Ceramic Electric Clock  US $16.00
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 VINTAGE RETRO GENERAL ELECTRIC PURPLE ALARM CLOCK MOD 1960S US $12.99
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 RESTORED 60s ELECTRIC KIT CAT KLOCK KAT CLOCK COPPER JEWELED ORIGINAL VINTAGE US $225.00
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 Vintage General Electric GE Red Kitchen Wall Clock Mid Century Modern Retro US $29.95
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I have a 1964 clock that has silver coins for the numbers, I need new electric clockworks for it. Any help?
I want to sell this item on E-bay and think it would sell a lot better if it was in original condition. It worked until about 5 months ago and then just stopped. A clock repain man told me it would cost about $50.00 to have the clockworks replaced. I can do it, I just need the works. If anyone can help I would appreciate it.
Im not sure but I think this may be helpful http://www.timesavers.com/
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Vintage 1930s Ceramic Electric Clock US $16.00
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VINTAGE RETRO GENERAL ELECTRIC PURPLE ALARM CLOCK MOD 1960S US $12.99
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RESTORED 60s ELECTRIC KIT CAT KLOCK KAT CLOCK COPPER JEWELED ORIGINAL VINTAGE US $225.00
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Vintage General Electric GE Red Kitchen Wall Clock Mid Century Modern Retro US $29.95
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 General Electric clock electricRARE heavy works great US $50.00
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 Electric Neon Clock Company CLOCK SUPERB US $1,200.00
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 Vintage GE TELECHRON electric desk clock Model 7HB141M US $20.00
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 Vintage Westclox Electric Bedside Alarm Clock Made in USA US $4.97
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 Vintage Mid Century General Electric GE green flower wall clock US $9.99
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 General Electric Wall Clock Model 2151 Free Watch US $11.99
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 Vintage Electric Alarm Clock Seth Thomas Yukon Model US $9.99
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 Vintage 1973 Holly Hobbie Electric Clock Keep a Song in Your Heart Nice US $9.99
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 nite lite antique battery or electric alarm clock parts or repair US $13.38
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 VINTAGE Tempus Fugit SUNBEAM ELECTRIC MANTEL Wall GRANDFATHER CLOCK WAY NICE US $19.99
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 Vintage Wood Plymouth electric Alarm Clock and FREE SHIPPING US $18.88
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 Vintage GE General Electric 8142 4 Lighted Dial Retro Flip numbers Alarm Clock US $8.99
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 50s Diner Style Neon Pink Blue Heavy Plastic Chrome Electric Wall Clock US $24.97
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 Vintage Bilt Rite Wall Clock Electric 40s 50s Retro Look Works Good US $12.00
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 LOOK KITSCHY RETRO SPARTUS ELECTRIC WALL CLOCK SHABULOUS US $19.99
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 Magazine ADvertisement 1929 SANGAMO Electric CLOCK Ellsworth 65 x 95 US $7.99
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 VINTAGE 1947 WORKING ENSIGN NAUTICAL WHEEL ELECTRIC SHELF MANTEL CLOCK US $39.99
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 Vintage GE Clock Radio 7 4550C General Electric US $12.00
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 Vintage United Clock Co Electric Wall Clock Rusted to the Bone US $60.00
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 Sessions Black Marble May be Slate Guilt Deco Shelf Electric Clock US $49.95
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 Retro Vintage 1972 Seth Thomas AC Electric Wall Clock Faux Wood Lime Coolness US $9.99
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 ART DECO STYLE ELECTRIC CLOCK IN WALNUT SURROUND 1940s US $23.69
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 Vintage Herschede Tambour Westminster electric H 850 Mantel Clock US $19.90
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 VINTAGE ELECTRIC CLOCK UNITED CLOCK CO USA SMALL GRANDFATHER CLOCK DESIGN WORKS US $10.50
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 Antique SESSIONS Electric Mantle CLOCK Marble Stone Case Bubble Glass Face WORKS US $75.00
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 early 70s General Electric kitchen wall clock excellent condition US $40.00
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 Vintage Lincoln Electric Mantle Clock US $13.95
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 Vintage RETRO GE General Electric Telechron Wall Clock US $16.06
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 vintage Lux electric kitchen wall clock sixties style perfect condition US $35.00
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 1957 Mastercrafters Electric Motion Action Clocks Ad Page Swinging Playmates US $9.99
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 VINTAGE NEW HAVEN WESTINGHOUSE BANJO WALL CLOCK ELECTRIC US $24.99
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 1950 vintage General Electric kitchen wall clockmodel 2H115 US $35.00
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 ORIGINAL VINTAGE GUINNESS TIME PERSPEX CHROME ELECTRIC PUB ADVERTISING CLOCK US $41.10
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Atomic Clocks and Ntp Servers
In conventional electronic clocks time is kept by running an electrical current through an oscillator which produces a repetitive electrical signal this is then governed by a quartz crystal to keep precision. These crystal oscillators are far more accurate than mechanical clocks but will still drift, perhaps over a second a week.
For day-to-day use crystal oscillators are a fine way to keep track of time; in the everyday running of our lives, a second makes very little difference, however, as light or radio waves can travel 300,000 miles in a second, some high technologies such as satellite navigation or global communication, require far more accuracy to be possible.
Atomic clocks are a timekeeping device that uses the known atomic resonance frequency of an atom to keep time. The first truly accurate atomic clock was built in 1955 at the National Physical Laboratory in the UK and was based on the caesium atom -133 which oscillates at exactly 9,192,631,770 every second.
This oscillation is actually a repetitive signal from the microwave radiation emitted by electrons in an atom when they change energy levels. Much of an atomic clock is designed to create the correct state to cause and augment oscillations.
Although other atoms can be used, the oscillation (9,192,631,770 a second) of the caesium -133 atom is now accepted by the International System of Units (SI) as being the definition of one second.
Atomic clocks are generally very large and constitute many highly technical apparatus such as vacuums and require whole teams of scientists to maintain and monitor the clocks. Much of which goes into compensating for unwanted side-effects such as frequencies of other atoms in the clock and even gravitational dilation (where according to Einstein’s theory clocks at different heights run differently because of the differences in the gravitational field) This makes atomic clocks highly expensive.
Fortunately many large scale national physical laboratories transmit radio time signals from their atomic clocks which can be used to synchronise standard crystal oscillators too.
Atomic clocks are also the basis of GPS (Global Positioning System) as each satellite contains an atomic clock as accurate time is integral for positioning (a position anywhere is made up of a direction, a velocity and time).
GPS signals can also be used to capture a time signal. This is now the most common way computer networks retain accurate time which is also essential in many communications and applications.
Most computer networks use a NTP server (Network Time Protocol) to synchonise their devices to an atomic time signal received via the GPS network.
A universal timescale, UTC (Coordinated universal Time), has been developed based on the time told by atomic clocks, TAI (International Atomic Time). UTC accounts for the slowing of the Earths rotation by adding leap seconds to TAI so as to prevent the gradual drift of night into day (although that would take 40,000 years or so) and allows the whole world to communicate using the same timescale.
About the Author
Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated NTP clocks. Please visit us for more information about NTP or other network time server solutions.
