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11 Jan 2011 [10:00]
What caused this amplitude shift? There is a small drop in temperature and if you look at amplitude v. temperature over the last month (since the weather station was moved into the pendulum chamber) [link] you see multiple episodes of correlation between amplitude and temperature, but these are probably due to changes in drag (temperature rise causes density drop). My theory though is that a temperature rise also indicates a change in air flow so that warm air is now rising causing amplitude increase. Maybe a good idea to seal up the pendulum chamber more properly.

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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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