On Wed, Jun 15, 2016 at 3:46 PM, Stewart C. Russell via talk < talk@gtalug.org> wrote:
> > If you're lucky enough to get a tour of the IESO's HQ, they have a relic > of the 25 Hz era on the wall. It's the display clock from the Shortt > Synchronome pendulum clock they used to use to regulate the grid. > Synchronomes are the most accurate mechanical clock ever made, and one > has even been used (briefly, ill-advisedly) as an NTP server. > > Now that is a lovely piece of timekeeping. Elegantly simple, and 2.3ppb??! That's a remarkable achievement for any clock from any era, let alone almost 100 years ago. Your average quartz oscillator is five hundred times *less* precise. With that kind of medium-term stability, it could probably be used to discipline a quartz-based clock (with requisite filtering) to generate quite respectable NTP service.
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