Biased wheel
Wheel wey get physical defect wey make some pockets come out pass 1/37. E rare, and you fit only find am with thousands of spins wey you record.
For context
FretequipmentFretDi metal wey divide two pockets for di wheel.Read di whole tin → wey loose, rotorequipmentRotorDi part of di wheel wey dey spin and carry di pockets.Read di whole tin → wey tilt or pocketsequipmentPocketOne of di 37 small boxes wey get number for di rotor. Dem also dey call am: slot, cup.Read di whole tin → wey don wear fit shift di probabilities by small fraction of one percent. Di Lab dey explain how to separate dat one from noise.
Joseph Jagger win for Monte Carlo, around 1880, na di case wey popular. Di earliest account tok sey di casino begin move im wheels from one table to anoda, den e order new ones wey get partitions wey fit move.