| 摘要 |
<p>Tower formed in two sections has the upper part(1) with a hexagonal cross section and is mounted on a ledge(9) on a square base(2). The upper part(1) has a central hole(12) which is just large enough to allow the passage of the ball(B). The base of the tower(2) has six sloping radial grooves(16, 19) aligned with openings(23) in each of the six faces of the upper part(1). When the ball(B) is dropped through the hole(12) it lands on the central platform(14) and rolls off at random through any one of the grooves(16, 19) and is brought to rest by the outer edge(26).</p> |
