a bowl rotates around a shaft 12 that extends up from a base 11 . the bowl rests vertically and radially against ball bearings 121 and 121 &# 39 ;. the bowl is in two parts in accordance with the present invention and comprises a bottom 21 and a ring 22 . the bowl rests on bottom 21 by way of a hub 211 . ring 22 is provided with numbers 221 and rests on the outer edge of bottom 21 . bottom 21 incorporates an inner ring 24 surrounded by number ring 22 and accommodating the canoes 241 that intercept the ball . canoe ring 24 surrounds the center of the bowl . a pan 26 that conceals the center rests on canoe ring 24 . hub 211 extends up out of bottom 21 and through pan 26 . pan 26 is secured to bottom 21 by a nut 213 that screws down against pan 26 on hub 211 . a rim 223 around the lower surface 222 of number ring 22 fits against a matching recess 212 in the bottom 21 of the bowl , leaving a slight gap s . gap s is left over , once number ring 22 has been attached to bottom 21 , in the form of a groove 214 that extends around the inner surface of recess 212 . radial bores 224 extend through the rim 223 around the lower surface of number ring 22 . bores 224 accommodate balls 224 . balls 224 are forced into groove 214 by springs 228 , maintaining number ring 22 fastened to bottom 21 . springs 228 can be adjusted by means of plugs 227 . accommodations 229 are distributed at equal intervals along a circle on the lower surface 222 of the number ring 22 . each accommodation 229 is aligned with one of the divisions 221 &# 39 ; between the number fields . there are preferably as many accommodations 229 as divisions 221 &# 39 ;. there is a matching circle of bores 215 that extend through the bottom 21 of the bowl . each bore 215 accommodates a ball 216 . balls 216 are subject to springs 218 that force them into accommodations 229 . springs 218 are maintained in position by plugs 217 in bores 215 . number ring 22 is accordingly secured by tension in relation to the bottom 21 of the bowl subsequent to each turn in the direction indicated by double - headed arrow a with the fields accommodating numbers 221 definitely oriented in relation to the canoes 241 in the bottom of the bowl and especially on the ring that rests thereon . there is a bore 219 extending through the bottom 21 of the bowl under pan 26 . there is a corresponding circle of several bores 111 extending part - way through base 11 . the present invention is intended to allow angular displacement in the direction indicated by double - headed arrow a of number ring 22 around the bottom 21 of the bowl with canoe ring 24 resting on it . how this is accomplished will now be described . nut 213 is loosened and pan 26 removed . a bolt is inserted through one of the bores 219 in bottom 21 and into the bore or into one of the bores 111 in base 11 , securing bottom 21 in relation to base 11 . number ring 22 can now be angularly displaced around bottom 21 in the direction indicated by double - headed arrow a against the inherent resistance deriving from the force exerted on balls 224 by the springs in accommodations 229 , altering the association between numbers 221 and canoes 241 . the bolt securing the bottom 21 of the bowl to base 11 is now extracted and pan 26 replaced and secured to the bottom by means of nut 213 . the roulette equipment is now ready for use , but with the association between numbers and canoes altered . the bowl , and accordingly its bottom 21 , and number ring 22 are entirely surrounded by an elevated edge 112 around base 11 . elevated edge 112 accommodates at least one port 113 that provides access to the bores 224 extending through the rim 223 around the bottom of number ring 22 and in particular to plugs 227 in the form of headless screws when the ring is correctly oriented in relation to ports 113 .
to make it more difficult for system gamblers to predict their chances of successfully placing their chips , the number ring in roulette equipment is an independent component that rests on the bottom of the bowl and can be angularly displaced from outside against inherent resistance . the ring is re - adjusted from time to time by the casino personnel to contaminate the probabilities .