Now we're all going to need to GPS or use an atomic time standard to discipline 
our mechanical flip clocks like http://leapsecond.com/pages/atomic-nixie/

On 2011 Jun 25, at 19:14 , neutron spin wrote:

> I think the original idea of grid frequency maintenance is when clocks were 
> purely mechanical before the digital era.  They of course were just 
> synchronous A.C. motors that were terribly inaccurate without the 
> synchonization to the power grid's frequency.  This also was before GPS and 
> sophisticated devices to reference to.  The only concern to electric 
> utilities today is synchronizing the generators when bringing them online to 
> avoid motoring...but that does not require any great frequency tolerance 
> since it is all relative....
> 
> 

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