Hi Egon.

You wrote:
<This is why electric clocks are extremely accurate.  >

I'm pretty sure that over a 24 hour period, the mains has to be +/- 1
cycle.  i.e. in the UK the generators must turn exactly 4,320,000 times in
24 hours.  Short term variations are not worried about excessively.  At
different times of day I see mains hum bars going UP the TV screen, and at
other times they go DOWN.  Our TV frame timebase is 50Hz.

Chris Dupres
Surrey, UK.

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