Bob Ammerman wrote:
> 2 Hz would be a huge swing in North America. My work with power plants
> indicates that the frequency transducers they use are typically scaled to
> measure from 59.9 to 60.1 hertz.

You're probably right, it was a long time ago. I thought it was varying 
between 59 Hz and 61 Hz, maybe it was like you say only 0.2Hz. I remember 
bringing this up to my electronics professor, when he said that the mains 
frequency is very stable and can be used to drive clocks. His reply was that 
it's stable over time, but not instantaneously.

Vitaliy


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