| 摘要 |
The roulette comprises two or more concentric rings (10) separated from one another. Each of the rings (10) is divided into subsets of natural numbers which are indicated by the ball indicator (7), which begins from the centre of the disc. In the spaces between the marked concentric rings (10), floating ring baffles (11) are installed, functioning if necessary as barriers which prevent the ball (7) from returning to previously played positions.
|
