DIYbanter - View Single Post

On Fri, 14 Apr 2006 15:00:33 UTC, (Alan J. Wylie)
wrote:

During periods of high demand, the frequency will drop slightly. To
compensate, the frequency will later be increased so that there are
the same number of cycles per day, so that the long term accuracy of
synchronous electric clocks is very good. If you don't have a seconds
hand, no-one will even notice the short term inaccuracies.

As a matter of interest...when you see those pictures of the control
room, there are two clocks near top right. One is grid driven, the other
is 'crystal' driven (probably rather better than that, these days). They
*ought* to read the same...

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