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A clock in which rings revolving inside each other. It has a working prototype.
Archimedes clock
It's 3 o'clock.
The smallest ring goes around in the middle one in a hour. The middle ring goes around in the big one in twelve hour. Because of this circular movement the small inward facing pins are always in a position like the arms of a regular clock.
                3:12                                3:24                                3:36                                3:48                                4:00