[time-nuts] Clock Calibration

paul swed paulswedb at gmail.com
Thu Jan 27 21:13:09 UTC 2011

Boy I sure don't know but.
I could make some assumptions especially if it were 100 years ago. I might
guess its either a sun or star track and the fact that exactly 24 hours
later it crossed. Granted the clock could be adjusted so that its tick would
exactly cross. Most likely a light/candle and a small mirror on the
pendulum.... This would not account for any of the effects we consider
today. Just my crazy useless way of thinking.

On Thu, Jan 27, 2011 at 3:55 PM, Perry Sandeen <sandeenpa at yahoo.com> wrote:

> List,
> I was reading some of the history of mechanical clocks and was astonished
> to see that one guaranteed its accuracy to 2 milliseconds per day! (And it
> was) Now this same clock when tested with modern equipment tested to be
> accurate to 200 micro-seconds per day.  Astonishing!
> This got to wondering how the heck they were able to calibrate a clock to
> milliseconds per day back then?
> And as extension to that question, how do they prove the accuracy of F1 or
> other similar time standards?
> Regards,
> Perrier
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