Clock Running
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 Vintage Chelsea Boston Round WORKING Electric Clock Bakelite Model DECO RETRO  US $24.99
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 Vintage Solid Oak DA 31 Day Regulator Chime Wall Clock US $129.00
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 Seth Thomas Shelf Mantel Clock Parts Or Restore Plymouth Conn USA N R US $43.00
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 New Haven Mantel clock with Gilding fro parts or repair US $62.95
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 SETH THOMAS ANTIQUE LONG ALARM CLOCK US $160.39
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 1928 SETH THOMAS WESTMINSTER CHIME CKOCK 98 US $83.85
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 Vintage Art Deco Cyma Amic Sonomatic Alarm Clock 15 Jewels AS IS NR US $15.50
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 VINTAGE LATE 50S EARLY 60S SESSIONS CEREMAC ELECTRIC CLOCK US $24.99
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 3 VINTAGE ELECTRIC WALL CLOCK CLOCKS WESTCLOX SESSIONS ONE WORKING RESTORE US $7.99
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 ANTIQUE INGRAHAM ADRIAN BLACK ORNATE MANTEL SHELF CLOCK RUNNING 8 DAY OLD US $61.00
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 34 FREE SWINGER 4 U 2 FIX LOOKS GERMAN SHIPS FREE NR US $131.50
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 LUX CLOCK MFG CO MINIATURE SCOTTIE DOG SCOTTIE PENDULETTE CLOCK WATERBURY CONN US $79.99
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 C1914 Ansonia Model Ormonde Enameled Iron Clock With Open Escapement US $227.50
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 ANSONIA AMAZON MODEL CHROME TIME STRIKE ALARM CLOCK US $49.99
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 eames atomic mad men FORESTVILLE STARBURST SUNBURST WALL CLOCK US $99.99
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 Antique Coo Coo Clock Light Finish US $100.00
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 GILBERT CRYSTAL REGULATOR OPEN ESCAPEMENT FANCY BANDED CASE MANTLE CLOCK US $201.48
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 Vintage Jefferson Mystery Clock in Nice Cond It Does Not Run But Looks great US $55.00
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 VINTAGE R CARR DESK CLOCK HALLMARKED STERLING SILVER BORDER US $28.00
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 Vintage Art Deco Jefferson Golden Hour Mystery Clock Electric Parts or Repair US $31.99
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 OLD VINTAGE SMITHS ENGLISH MADE IN ENGLAND LONDON MANTLE SHELF CLOCK PARTS US $11.31
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 BEAUTIFUL ANTIQUE VINTAGE WELCH PILLAR COLUNM MANTEL CLOCK US $195.00
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 Franklin Mint Royal Geographical Society World Globe Clock working US $595.00
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 1907 SETH THOMAS CRYSTAL REGULATOR RUNS GREAT US $127.50
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 STRANGE DIFFERENT BRONZE ART DECO DESK CLOCK CHEMO COMPANY ADVERTISING Doctor US $24.99
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 Vintage Ceramic Lux Mantle Clock Waterbury Conn US $19.99
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 VINTAGE GERMAN SETH THOMAS HAND WIND KEY CLOCK WITH RINGING BELL ALARM GERMANY US $19.99
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 OLD RARE ANTIQUE VINTAGE CUCKOO COOCOO CLOCK LUX WATERBURY CT NATURE SCENE NR US $26.95
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 Howard Miller Keywound 8 Day Oak Wall Clock Westminster German Movt in VGC US $127.50
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 New haven Minature CatlinDeco ClockLook US $40.00
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 French ART DECO Alarm CLOCK BAKELITE WATERFALL antique MACHINE AGE 1930 US $28.00
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 Vintage Kit Cat Clock 1960s Model D8 US $26.73
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 VTG GENIE LUMINOUS ALARM CLOCK GLOW IN DARK HANDS NUMBERS WORKS US $9.99
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 VTG PHINNEY WALKER TRAVEL ALARM CLOCK IN CASE LUX CLOCK MFGCO WATERBURYCONN US $9.99
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 Junghans Spring Drive RA US $35.00
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 Vintage International School Office Wall Clock Round Metal Slave Clock 1939 US $31.00
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 ANTIQUE SETH THOMAS MANTEL CLOCK NR US $.99
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 8 DAY WORLD SMALLEST MINI CONGREVE ROLLING BALL CLOCK with Rosewood Base US $850.00
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 VINTAGE BLACK GOLD CLOCK NR US $20.50
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 PAIR VINTAGE JEFFERSON GOLDEN HOUR MYSTERY CLOCKS NOT RUNNING US $19.95
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 VINTAGE 1960 ANIMATED STRIPED TIGER CAT CLOCK EYES TAIL MOVE SPARTUS US $63.80
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 Genuine Black Forest German Quail 1 4 hour Cuckoo Clock Rare Sears c1900 Model US $610.00
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 1890 Mercury French Crystal Regulator Pendulum US $57.99
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 Vintage Modern Set Of Chains for Hermle 2 Weight 8 Day US $7.00
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 Beautiful Antique German Kienzle Free Swinger wall clock at 1900 US $405.00
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 8 MM WW Size Watchmakers Lathe Drawbar Tap USA MADE US $35.50
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 Animated Kitten With Fish Bowl Clock Lots of Movement US $26.00
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 Oval French Style Carriage Clock eight day NICE US $56.55
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 8 Day New Haven 1875 Shelf Clock NO RESERVE US $55.50
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 BEAUTIFUL LARGE ANTIQUE GUSTAV BECKER VIENNA REGULATOR CLOCK TWO WEIGHTS US $260.00
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 BeautifulAntique German Mauthe Balcony Free Swinger wall clock at 1900 US $585.00
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 VINTAGE CLINTON REPEATER 7 JEWEL ALARM CLOCK SWISS MADE US $9.99
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 New Traditional Handcarfted Roof Top Birds and Leaves Wooden Cuckoo Wall Clock s US $39.99
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 New Handmade Handpainted Countryside Cock Hen Chick Wooden Cuckoo Wall Clock s US $39.99
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 New Traditional Hand Carved Roof Top Deers and Flower Wooden Cuckoo Wall Clock s US $39.99
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 ANTIQUE GOLD STATUE BOUDOIR CLOCK MANTEL LOOKS AND RUNS GREAT US $11.50
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 HAMBURG AMERICAN LARGE GERMAN ANTIQUE WALL CLOCK ALL ORIGINAL LOOKS RUNS GREAT US $198.49
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 Antique Calumet Baking Powder Wall Clock RARE Advertising Clock US $675.00
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 Large Hunters 8 day cuckoo clock complete running regula 34 west german US $66.00
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 New Traditional Mini Handcarfted Roof Top Bird Leaves Wooden Cuckoo Wall Clock s US $19.99
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 Vintage 8 day clock Patent 1918 Minneapolis Mod 77 Brass runs no wind key US $49.95
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 1970s Jaeger LeCoultre ATMOS Clock Square Face ORIGINAL BOX Manual NICE US $595.00
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 Wall clock seed vintage handmade made in kingdom Thailand Siam US $12.22
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 EXQUISITE ANTIQUE FRENCH PAINTED PORCELAIN BRONZE MANTEL CLOCK JAPY FRERES US $599.00
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 Hamilton westminster chime Mantel Clock US $50.00
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 1930s Deco Purse Travel Clock Ermeto Style US $15.00
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 Antique Seth Thomas Mahogony Beehive Mantle Parlor Clock Works Great Very Nice US $85.00
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 Antique Ansonia Ornate Gilt Victorian Carriage Clock US $350.95
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 Antique Brass French Carriage Clock Travel Case US $225.95
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 Vintage Tiffany Co Art Deco Chrome Plated 11 Jewels Swiss Carriage Clock US $595.95
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 6 ASSORTED CLOCK HANDS PARTS NO RESERVE US $5.04
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 Vintage Unusual BB Remembrance No Hands Magnetic Ball Clock US $40.00
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 5 ASSORTED CLOCK HANDS PARTS NO RESERVE US $2.99
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 Morbier French wall clock US $520.00
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 Morbier French clock in new tall case US $775.00
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 HEUER ALTERNATIVE RALLY 8 DAYS CLOCK US $249.00
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 LOT OF 13 PENDULUM RODS PARTS NO RESERVE US $2.99
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 Vintage Alarm Clock US $9.99
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 Antique Seth Thomas mantel clock wood case 8 day time strike US $65.00
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 Vintage Linden Black Forest Alarm Clock Made in Western Germany US $10.00
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From satellite navigation to the NTP time server, atomic clocks are used the world over
From satellite navigation to the NTP time server, atomic clocks are used the world over.
We are all used to our watches and clocks running a minute or two fast or slow. However, the odd minute doesn’t affect our lives too much and we can get by. However, for some technologies and applications a far greater level of accuracy is needed. Atomic clocks are the most precise time keeping devices on earth. They were invented over fifty years ago when it was discovered that the oscillations of certain atoms at particular energy levels never altered and vibrated at such a high frequency (over 9 trillion times each second for caesium).
Modern atomic clocks are so accurate they will not lose as much as a second in 100 million years but who on earth would need such accuracy? Atomic clocks provide the basis for many modern applications and technologies and have also helped in our understanding of the physical universe.
Atomic clocks form the basis of the GPS satellite navigation system that we use in our cars. The signals from the atomic clocks onboard the satellites are what is used to triangulate accurate positioning. It ca only be done because of the highly precise nature of the time signals. A one second inaccuracy of a GPS clock could see positing information out by 100,000 km as light can travel this far in that time.
Atomic clocks have also been used as a method of testing theories by Einstein and others. Using atomic clocks we can accurately measure gravity and the way it affects time. Modern clocks are so accurate that scientists can even measure the difference in gravity (and therefore time) at each subsequent inch above the earth’s surface. They can also be used to measure slow moving processes like continental drift or the slight changes of the earth’s rotation.
Other applications where accuracy is essential also rely on atomic clocks such as air traffic control where the precise nature enables safe monitoring of air traffic. Road traffic systems like traffic lights are increasingly using time servers hooked up to atomic clocks to ensure perfect synchonization. Even internet the internet relies on atomic clocks, particularly when it is used for time sensitive transactions such as banking, trading in stocks and shares and even online seat reservation. Without accuracy in time then applications like this wouldn’t be possible as too errors could occur such as double booked seats, shares sold before they were bought.
Computer networks synchronize to atomic clocks by using network time servers. Often these devices use the protocol NTP and receive the atomic clock time from either the GPS system or a radio transmission. NTP time servers monitor and adjust all clocks on devices on a computer network to match the atomic clock time.
About the Author
Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about an NTP server or other NTP time server solutions.
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