| 摘要 |
An automatic roulette wheel 40 in which, at the end of a turn, the ball (a) is ejected from the pocket 13 by a jet of air and moves to the top of the ball track 14. The ball is held against the edge of the ball track and propelled around the ball track by air jets and, after a predetermined time, the air jets are turned off and the ball spirals down the slope into a pocket on the contra-rotating wheel. The process can then be repeated with the directions reversed, kept the same or randomly varied.
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