Clock German
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 Wireless Indoor Outdoor Weather Station Alarm Clock 08c  US $13.99
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 PERSONALISED SONIC WALL CLOCK US $14.21
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 FLYING SCOTSMAN STEAM TRAIN WALL CLOCK US $14.21
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 Vintage Grandfather Clock with Triple Chimes German made US $475.00
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 La Crosse Technology WS 8117U IT Atomic Wall Clock Available in Cherry or Oak US $45.35
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 Novelty Unusual Tea Time Wall Clock US $39.49
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 POLKA DOT LARGE WALL CLOCK IN RED kitchenbedroomchildrens by CUTE CLOCKS US $39.51
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 Movado Clock MSI 172 M in silver Brand NEW US $120.00
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 MIKASA QUARTZ GERMAN CRYSTAL DESK CLOCK VERY NICE CLOCK US $24.95
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 1899 Hop Growing for Microbrewries on CD US $9.99
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 1940s German Wooden Clock Case Only US $45.00
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 Quartz Pendulum Wall Clock Made from Antique Dial Free USA Shipping US $55.00
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 STUDIO NOVA QUARTZ GERMAN CRYSTAL DESK CLOCK VERY NICE CLOCK US $24.95
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 Rexite quality Retro Italian Wall Clock Zero by barbieri e marianelli US $19.71
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 German Cuckoo Clock 3 Pinecone Weights Wooden Painted Dancing Spinning Couples US $15.50 |
 VINTAGE MANTEL DESK CLOCK MAUTHE GERMAN MADE US $7.89
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 Brand New 75 HP Rotary Screw Air Compressor US $24,091.00
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 Brand New 75 HP Rotary Screw Air Compressor w Dryer US $34,240.00
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 100 HP 3 Phase Rotary Screw Air Compressor Package US $39,010.00
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 Vintage German Peter Table Desk Clock Gilt Frame Stained Glass Grapes US $67.99
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 Brand New 40 HP Rotary Screw w Dryer US $18,477.00
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 Industrial 50 HP Rotary Screw Air Compressor US $14,960.00
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 Polar Air 50 HP Rotary Screw Air Compressor US $14,960.00
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 Polar Air 40 HP Rotary Screw w Dryer US $18,477.00
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 Industrial 40 HP Rotary Screw w Dryer US $18,477.00
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 Polar Air 60 HP Rotary Screw w Dryer US $22,546.00
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 Brand New 50 HP Rotary Screw w Dryer US $20,790.00
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 BAFFALO CHINA RARE 1927 Sprengers Large Divider White Platter US $100.00
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 LCD Sensor Voice Talking Projection Sound Control Alarm Clock 816 US $14.99
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 HERMIE MANTLE CLOCK US $55.00
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 NIB 8 Day Cuckoo Clock Hand carved Oak Leaves Owls Birds Bird Nest 18 US $248.93
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 BRAND NEW Neato XV 11 Robotic Cleaner APRIL 2012 STOCK HAS LATEST FIRMWARE US $490.00
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 Maxforce Pro Killer Roach Gel Bait Hydramethylnon 4x30g US $21.95
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 STAIGER QUARTZ GERMAN CRYSTAL DESK CLOCK VERY NICE CLOCK US $19.95
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 La Crosse Atomic Digital Wall Clock w Temperature Moon Phase LCD Screen NEW US $37.99
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 St Georgen German Quartz Grandfather Clock with Pendulum NEW US $275.00
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 PERSONALISED WWF WALL CLOCK US $14.21
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 German ERWIN SATTLER 1119 Walnut Table Clock Brand NEW Very Expensive RARE NR US $100.10
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 Movado Desk Table Alarm Clock German Movement Gold Black Tone Tested US $40.00
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 New Old Stock Vintage Mantel Shelf Clock Brass Cast Base German Peter Mechanism US $110.99
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 Beautiful rare Mantel Clock f Pfeilkreuz 20s US $145.00
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 1 Maxforce Pro Killer Cockroach German Roach Control Gel Bait Hydramethylnon 30g US $9.95
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 FRENCH LEAD CRYSTAL WITH STAIGERT GERMAN QUARTZ CLOCK US $.99
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 cuckoo clock Alpine chalet black forest 1 day NEW US $422.00
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 4 Maxforce FC Cockroach Roach Pest Control Gel Bait 30 Gram Tubes w 1 Plunger US $22.95
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 Mini GOOD MORNING Desk Table Shelf Alarm Bell Clock Israel US $16.99
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 Original Black Forest musical cuckoo clock pendule coucou Kuckucksuhr NEW NEU US $158.03
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 JELLY BELLY CANDY COCKTAIL CLASSICS Party Favor 1 Flip Top Box US $.50
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 High Torque Quartz Clock Movements with Long Hands US $22.99
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 Maxforce FC Cockroach Roach Control Gel Bait 4 Tubes US $22.95
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 VPRETTY WESTMINSTER CHIMES WALNUT MANTLE CLOCK ART DECO GREAT WORKING ORDER US $1.56
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 Vintage Oak Wall clock German made beveled glass time gong US $99.99
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 BULOVA SHELF MANTEL OR DESK CLOCK WITH ALARM GERMAN MOVT WOOD WORKS GREAT US $30.00
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 20 Tubes Maxforce FC Cockroach German Roach Pest Control Gel Bait w 5 plungers US $118.95
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 EARLY PF BOLLENBACH GERMANY CLOCK MODEL 3200 MANTEL RARE NR US $9.00
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 Set of 2 LaCrosse Atomic Wall Clocks US $70.00
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 Maxforce Pro Roach Killer Bait Gel Hydramethylnon 4 Tubes 30 grams per tube US $27.49
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 NIB Weems Plath Catalina Quartz Clock Brass 300500 Fathers Day Gift US $159.93
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 NIB Weems Plath Atlantis Quartz Clock Chrome 220500 Fathers Day Gift US $399.93
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 NIB Weems Plath Martinique Barometer Brass 190700 Fathers Day Gift US $199.93
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 NIB Weems Plath Orion Ships Bell Quartz Clock Brass 400100 Fathers Day US $299.93
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 La Crosse Technology Atomic Digital Wall Clock Red Model WS 8117U IT C US $31.95
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 Chronos Classic Speedometer Clock Porsche 356 US $61.62
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 Sunrise System Natural Dawn Simulator Alarm Clock SRS210US US $114.00
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 Cherry Atomic Wall Clock with Moon Indoor Outdoor Temperature WS 8117U IT C US $36.99
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 La Crosse Technology Atomic Digital Wall Clock with Moon Phase Temp US $32.99
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 Intelligent Forecast Station Predicts Nighttime Low Temp Weather Events US $100.99
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 La Crosse Technology Atomic Digital Wall Clock with Date and Temp Display US $24.99
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 12 Maxforce FC Cockroach German Roach Bait Stations US $15.95
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 Black Forest Weather Forecast House NEW US $14.95
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 Used German 1 Day Cuckoo Clock Cast Metal Weight 275 or 320 Grams US $4.95
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 Sound Voice Clapping Control Backlight LCD Projection Clock Thermometer Calendar US $14.99
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 New hand carved German cuckoo clock pendulum 1 US $10.27
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 Maxforce Pro Cockroach German Roach Control Gel Bait US $26.95
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 HUNTER XC 230V 220V EUROPEAN X CORE XCORE OUTDOOR CONTROLLER TIMER CLOCK US $100.75
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 Hechinger RC Movements Radio Control for Atomic Clock Making Hands Included US $17.99
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 German cuckoo clock quartz Black Forest musicians US $219.00
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 UTS German Quartz Clock Movements inc Red Hands US $9.47
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 2 Tubes Advion Cockroach German Roach Control Gel 12 Maxforce FC Bait Stations US $31.95
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 German Black Forest Weather House Clock barometer key US $97.58
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Atomic Clocks Now Doubled In Precision
As with the advance of computer technology that seems to exponentially increase in capability every year, atomic clocks too seem to increase dramatically in their accuracy year on year.
Now, those pioneers of atomic clock technology, the US National Institute of Standards Time (NIST), have announced they have managed to produce an atomic clock with accuracy twice that of any clocks that have gone before.
The clock is based in a single aluminium atom and NIST claim it can remain accurate without losing a second in over 3.7 billion years (about the same length of time that life has existed Earth).
The previous most accurate clock was devised by the German Physikalisch-Technische Bundesanstalt (PTB) and was an optical clock based on a strontium atom and was accurate to a second in over a billion years. This new atomic clock by NIST is also an optical clock but is based on aluminium atoms, which according to NIST’s research with this clock, is far more accurate.
Optical clocks use lasers to hold atoms still and differ to the traditional atomic clocks used by computer networks using NTP servers (Network Time Protocol) and other technologies which are based on fountain clocks. Not only do these traditional fountain clocks use Caesium as their time keeping atom but instead of lasers they use super-cooled liquids and vacuums to control the atoms.
Thanks to work by NIST, PTB and the UK’s NPL (National Physical Laboratory) atomic clocks continue to advance exponentially, however, these new optical atomic clocks based on atoms like aluminium, mercury and strontium are a long way from being used as a basis for UTC (Coordinated Universal Time).
UTC is governed by a constellation of caesium fountain clocks that while still accurate to a second in 100,000 years are by far less precise than these optical clocks and are based on technology over fifty years old. And unfortunately until the world’s science community can agree on an atom and clock design to be used internationally, these precise atomic clocks will remain a play thing of the scientific community only.
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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