Human folly for 02018-11-21

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• The remarkable accuracy of the Trinity college clock and what makes it tick (theconversation.com):

  Hugh Hunt, Keeper of the Clock, explains how the Trinity College tower clock works and reaches 0.1 ppm precision, how gravity escapements work, and how John Harrison’s gridiron pendulum corrects for temperature by causing its #TCE to vanish through differential cancellation. cc-by-nd. #metrology #horology #hardware