But this was not at all the case in the 60's where countries or
labs would vary by tens or hundreds of microseconds or even
many milliseconds.
See: http://www.leapsecond.com/hpj/v17n12/v17n12p16.jpg
And: http://www.leapsecond.com/hpj/v19n4/v19n4p18.jpg
A huge part of UTC was the formation of the paper clock where
all national labs contributed to the ensemble.
For those of you who want to dig deeper you can read copies
of old HP Journals at: www.hpl.hp.com/hpjournal/journal.html
In particular the articles related to synchronizing clocks in the
atomic era leading up to UTC are:
A New Performance of the "Flying Clock" Experiment
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1964-07.pdf
Correlating Time from Europe to Asia with Flying Clocks
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1965-04.pdf
World-Wide Time Synchronization, 1966
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1966-08.pdf
'Flying Clock' Comparisons Extended to East Europe, Africa and Australia
http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1967-12.pdf
These four papers have always been a favorite of mine.
/tvb
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