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15 Apr 2010 [22:00]
can anyone explain why the pendulum amplitude should increase suddenly like this: [link] . It happens gradually over two hours from 10pm to midnight. The only thought I have is reduced friction on the escapement as the cable on the drum winds down from the second layer to the first, but if so then why does it not happen every week?

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Contact: clockkeeper@trin.cam.ac.uk, Trinity College, Cambridge