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This wonderful device is used for the accurate prediction of the timing of tides, and their level. It incorporates 30 different harmonics to make its predictions, and features in my Oceanography futurelearn course.

Straightaway, I thought of the Antikythera mechanism. This film has a very hypnotic quality.

http://noc.ac.uk/news-multimedia/videos/tidal-prediction-machine-film-part-I

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