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11 Dec 2010 [07:40]
The Bedmaker Effect is absent - as expected, it is a Saturday. But I have a theory for what has been going on, and the sums sort-of stack up [link] . Essentially, warm air is forced into the pendulum chamber causing amplitude to increase due to reduced drag and going to decrease because the outer tube of the pendulum warms up - it takes a while for the temperature compensation to reach equilibrium. A test to do on a cold morning next week will be to leave the door open for long enough for an equilibrium to be reached.

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