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26 Mar 2013 [09:15]
ADJUST: +1000 ms/day to 36400 further adjustment required after last night meddling about.
26 Mar 2013 [09:10]
The fan (sucking the warm air up from below) does not seem to be doing anything. The air is still warmer down at the bottom (like a stubborn temperature inversion). So I have switched it around to blow cold air down. Maybe that will maintain a downward air flow - we will see.
26 Mar 2013 [01:00]
What happened here? Amplitude dropped and going fell - suggests the pendulum got longer.

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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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