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10 Mar 2013 [14:28]
So here is a theory: If the temperature down at the pendulum bob is high then the temperature compensation is not dealing with change in air density (buoyancy). This effect is +30ms/day per degC so a 4C warmer bottom would give rise to a +120ms/day on going. This is not far from observed - note that the clock slower down overnight as the pendulum chute cooled down. Maybe I need to open up the chute to contrive that cool air can get down to the bottom. I might do that next weekend....
10 Mar 2013 [12:12]
pendulum temperatures [15.0 14.3 14.3 11.1 9.9] and note that the minima overnight were [10.9 11.0 11.0 10.9 9.8] so it looks as if the pendulum bottom half cools down a lot overnight.

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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)].

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Trinity College, Cambridge 2014