On 26/08/11 11:46, David J Taylor wrote:
From the BBC: UK's atomic clock 'is world's most accurate', see:
http://www.bbc.co.uk/news/science-environment-14657002
There is a little more than those 6 "primary reference clocks"
contributing to TAI/UTC. Checking with Circular T and associated data I
found much more clocks, even a R&S Rubidium clock contributing a little.
There is also hydrogen clocks that contribute.
So, the article isn't completely correct.
The lower uncertainty of the NPL clock is found in that material.
Cheers,
Magnus
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