I heard of a system used in Melbourne between two major stations using pulses in a pipe of water to sync. I suppose that pulses travel much faster in water being incompressible, so better accuracy!
Tom Harris <celephi...@gmail.com> On 20 October 2015 at 07:00, Brian Inglis <brian.ing...@systematicsw.ab.ca> wrote: > On 2015-10-15 08:32, Tom Van Baak wrote: > >> Nick Sayer writes: >> >>> The WU standard time service goes back further than the turn of the 20th >>> century. It started in 1870. >>> >> > Also, for a screen full of irresistible SWCC photos, try this: >> https://www.google.com/search?tbm=isch&q=self-winding+clock+company >> >> My understanding (perhaps incorrect) was that the sync pulse was once >>> daily and, as you said, >>> would cause the hands to “snap” to 12. The trailing edge of the pulse >>> was synchronized and would >>> release the clock to operate normally. >>> >>> That they had something as accurate and widespread as it was so early is >>> astonishing. >>> >> >> Oh, Padawan, that's just the tip of the iceberg when it comes to the deep >> and fascinating history of precise timekeeping. >> > > Recently restored (after a building fire where some were lost) to working > 19 Art Nouveau master/slave clocks from 1910: > http://www.gsaarchives.net/2013/04/mackintosh-clocks-feature-on-bbc-news/ > more pictures in linked articles from BBC > -- > Take care. Thanks, Brian Inglis > _______________________________________________ > 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.