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Plot and as with

Best fit to data (blue line). Reference gradient (red lines):-605ms/day/deg C.
this is for an uncompensated steel pendulum -605ms/day/C (we hope to acheive within 10ms/day/C with compensation)

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19 Apr 2011 [11:15]
ADJUST: +100ms/day to 31150, thanks again Hilary. I have a far-fetched idea that going is proportional to long-term rate-of-change of temperature at -200ms/day per degC/day. This minor adjustment should help test it.

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Interval between data points: seconds [either 3 seconds (weather data is duplicated) or multiples of 60 seconds (all data is averaged)].

Contact:, Trinity College, Cambridge