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Slow Fourier Transform https://en.wikipedia.org/wiki/Tide-Predicting_Machine_No._2

This photo shows the largest of the three sections of Tide Predicting Machine No. 2, a special purpose mechanical analog computer for predicting the height and time of high and low tides. The gears on the left transmit power from the hand crank.

Clockwork of the machine.

Contron panel of the machine, with a mechanical pen plotter and three mechanical dias showing day, hour and minute.

Like 21 July at 10:45 | Open on mk.absturztau.be

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