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The rolling bell is a sort of instrument that turns wind power into electric power utilizing the light-shade imaging system to display time, which imitate the shape and principle of toy windmill. Placed at venting spot like balcony and garden, when the speed of wind blowing the face of bell arrives at 24 round/sec (with little difficulty), the electric power deriving from mechanical power could light the arrayed LED according to the principle set before, using humans illusion of vision to form a fictitious E-bell. This kind of interaction between human and product gains people f new method to acquire the time.
Professor Shi-Guo Li