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  2. Chris @chras

    I got one, its really cool but unpractical, the day is devided into 6 day and 6 night hours. But because the length of days and night are different all year long, there are two pendulums. And it switches between the two at 6 and 12 o'clock. But you have to change the length of the weight on the pendulums every day if you want a working clock.

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Gakken Otona no Kagaku Japanese Clock

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