Hi Jim, Nice video. I had not see that old one before. Someone at NPL must be going through archives. That's very nice of them to post it. Did anyone spot the date of the filming?
My understanding is that the era of traveling clocks gradually ended as various methods of satellite time transfer began. However people still use "traveling clocks" today as a backup for GPS, or to double check GPS, or in places where GPS cannot be received, or when one needs accurate results quickly without waiting for GPS averaging or post-processing. So the practice is not dead. Most recently we all saw it used to validate the neutrino timing experiments. Traveling clocks can also be used to demonstrate time dilation: http://leapsecond.com/great2005/ For more info on the traveling clock era make sure to read these four HPJ articles: World-Wide Time Synchronization, 1966 http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1966-08.pdf, page 13 A New Performance of the "Flying Clock" Experiment http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1964-07.pdf, page 1 Correlating Time from Europe to Asia with Flying Clocks http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1965-04.pdf, page 1 'Flying Clock' Comparisons Extended to East Europe, Africa and Australia http://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1967-12.pdf /tvb ----- Original Message ----- From: "Jimmy Burrell" <jimmydb...@gmail.com> To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Sent: Monday, March 03, 2014 5:17 PM Subject: [time-nuts] Time transfer, internationally before GPS > My apologies to the list if this has been posted before but I found it > fascinating. I'm guessing this was early 60's. > > I wonder if this practice continued until the advent of GPS? I be interested > to know if there was an interim technology and what it was. > > http://youtu.be/SXV4c5eVkE4 > > > Jim... > N5SPE > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
