Switzerland's most accurate clock.

[padi56]

The most accurate clock ever developed in Switzerland, the FOCS-1 device,accurate to one second in 30,000,000 years. but not COSC tested.

http://www.swissworld.org/eng/swiss_...rubricId=17160

And one more accurate to one second in a hundred million years.

http://news.bbc.co.uk/2/hi/science/nature/1435488.stm

[astcell]

So after 50 million years, do you just lay it on its side overnight?

[Blue Bull]

Depends if it runs slow or fast ....

[astcell]

Maybe just wave your hand in front of the light beam really fast.

[JJ Irani]

Thanks, Padi....interesting info!!

Robert, you're nuts!!

[padi56]

Originally Posted by JJ Irani

Thanks, Padi....interesting info!!

Robert, you're nuts!!

Wonder how members would check those for accuracy,but when you think of Harrison's G4 chronometer, not COSC tested.Made almost 300 years ago accurate to less than 1 second a day,on the most hostile place for a watch on the open sea.Then compare todays modern computer designed,and mostly machine made watches.With in Harrison's days all hand made with by todays standards very primitive tools.It put a whole different perspective on what we call a chronometer today.And yes Harrison's watch is still working, and keeping better time that most mechanical watches of today.Got to admit thats some achievement for a almost 300 year old timer.

[astcell]

How does COSC calibrate their time pieces? I always heard that to make a tool (ruler, micrometer, screwdriver) the too making he tool needs to be ten times as accurate. So are COSC timepieces ten times more accurate than the pieces they certify?

[padi56]

Originally Posted by astcell

How does COSC calibrate their time pieces? I always heard that to make a tool (ruler, micrometer, screwdriver) the too making he tool needs to be ten times as accurate. So are COSC timepieces ten times more accurate than the pieces they certify?

Well Robert just the bare movements are sent for testing no dial hands just with bare winding stem.The special dial hands are added at the COSC testing centre.Now they are all on a bench all wound by a machine, automatic winding is disconnected on autos.They are wound exactly the same and all tested by time lapse photography linked to a central computer which measure every watch at a certain time,over the scheduled test course.Then the blank movements are returned if pass or fail,at the time of testing.Now there is no time scale to when the bare passed movement is finally cased.Then on route to AD then to buyer,and quite a few need regulating soon after purchase