[time-nuts] Clock Calibration

[paul swed]

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.
Regards
Paul

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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