The Magic Sphere. A parabolic floor is rotated at such a speed that the centrifugal force about equals the attraction of gravitation. As a result a man standing on the outer edge will imagine that he alone is on a dead level and that the persons on the opposite side are walking on a vertical surface. If he moves across, it will seem to him as if the entire apparatus were rolling over with him like a ball floating on water. He will seem infinitely heavy, everybody else infinitely light. Circumferential walking is easy, diametrical walking difficult. Scientific American, 1906-06-16
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