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01 Aug 2010 [22:00]
Graham sensibly suggested that maybe the door of the pendulum case is rubbing on the pendulum - this would make sense as we closed the door firmly and locked it, where it was only partially closed before. This would reduce pendulum amplitude and hence speed the clock up

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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)].

[Raw data: Clock | Weather]

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