On 7/18/06, Mullen, Tim (IT Solutions) <Tim.Mullen@ngc.com> wrote:
>
> > Most digital clocks use the frequency of the a/c current
> > in the line as their "time".
>
> Most clocks in general. The analog clocks are set up for motors that
> turn in response to the 60 cycle frequency too.
>
> For somewhere I remember learning that the power companies very
> carefully control the 60 cycle frequency at the power generating plants.
> They control the frequency to something like within 1 cycle in a 24 hour
> period. It is very, very accurate.
It's very accurate over long intervals -- a day or more. A single
cycle can off a fair amount.
--
David Scheidt
dmscheidt@gmail.com
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