[GTALUG] mysterious restarts

Mike el.fontanero at gmail.com
Wed Jun 15 18:07:44 EDT 2016


On Wed, Jun 15, 2016 at 3:46 PM, Stewart C. Russell via talk <
talk at 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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