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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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01 May 2011 [18:15]
ADJUST: -250ms/day to 30900 (dropped 200ms/day down the pendulum chute ... bound to happen one day)
30 Apr 2011 [18:15]
Barometric compensator seems to have worked pretty well recently [link] [link] as has the temperature compensation [link] [link] . There is a lot noise on these plots, pretty sure this is due to temperature gradients in the clock chamber because it seems to be worse when the sun is shining strongly through the windows and when the central heating is at its hottest in the room below.

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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