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19 Jan 2023 [17:40]
Today finnally twigged that the variation in air temperatures when the doot to C5 Great Court is opened and closed is nothing to do with the opening and closing of the door. It's the switching on and off of the lights! I've replaced the halogen light nearest the pendulum with an LED hob light and the issue has gone away. I should also try turning off the radiator that is under the south window (nearly under the pendulum) so hopefully the temperature of the air in the pendulum chamber will be cooler and more uniform.

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