Hi, They used (late 1970's) WWV or WWVH to sync up the time. There was fancy system that used a neon on a rotating disc rather like an early depth sounder. Neon flashed with seconds beep. There was a way of rotating the field that drove the disk to advance/delay the system to set it fairly accurately.
Cheers, Will On 14/10/15 18:12, Hal Murray wrote: > [email protected] said: >> Somewhat time-nut related... the project main application needed >> millisecond consistent (not necessarily accurate) time stamps on a >> world-wide network. That was in the pre-gps, pre-fiber, pre-historic >> before-times. I don't think that they ever quite got there. > World wide seismology took off in the early 1970s as background for nuclear > underground non-testing treaties. Both the US and the USSR had to be sure > they could detect the opponents tests and distinguish tests from earthquakes. > We had seismic stations scattered around the globe. > > Does anybody know how they distributed time back then and/or how accurately > they could do it? > > Google says the speed of sound in rock is 6-8 km/s so 10 ms error would be > 100 meters. That seems like a reasonable ballpark. > > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
