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03 Aug 2010 [06:20]
A massive effect! One theory for why the pendulum only sometimes rubs the door of the clock case is that the lean of the tower varies with seasons and temperature. Ground water table variations will affect foundations (the post on my garden gate demonstrates this admirably). Also I estimate that the sun shining on the south-facing wall of the tower could cause a 5C temperature difference between the S and N faces, hence causing a lean, and 0.2mm shift in the position of the pendulum ...

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Trinity College, Cambridge 2014