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: I heard that there are mechanical watches that
: the second hand runs absolutely smooth, is
: it true or does it just run at higher
: frequency so the jumps are invisible?
They are high frequency so the jumps are invisible.
The limit of human peception due to the "persistence of vision" effect is about 18 events a second. That why very early movies from 1910 or so, which were shot at 16 frames per second, look jumpy. Modern film at 24 frames per second and television at 30 frames per second look like fluid motion, because the rapidly changing still images are too fast for you to see the individual movements.
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