| 摘要 |
A roulette wheel 1 has a central, rotatably-mounted disc 15 with conical surface 12 that is coupled via friction wheels 20 to rotate about a common axis with, but in the opposite sense to, the peripheral ring 13 having numbered ball-capture pockets 14, of a rotatably-mounted disc 16. The surface 12 may be textured with regular indentations and this together with the contra-rotation of the disc 15 retards a ball which having been launched from a ring 7 of the bowl-housing 2 of the wheel 1, passes onto the surface 12 through the pocketed ring 13 before falling back into one of the pockets 14. The ring 7 may be releasable from the housing 2 for replacement, and a crown 23 at the top of a central spindle 11 of the wheel 1 is recessed to receive a ball 24 for testing against a magnet 25 in confirming absence of ferromagnetic material. A spirit-filled vial may be used in the crown 23 for levelling the wheel 1. |
