This system probably dates back to the invention of the roulette wheel. The game relies on the spinning of a "dabo wheel" similar to a roulette wheel. This is usually performed using roulette wheel selection. The title refers to a roulette wheel. This could be imagined similar to a Roulette wheel in a casino. Then a random selection is made similar to how the roulette wheel is rotated. The pockets of the roulette wheel are numbered from 0 to 36. The deletion mechanism will select classifiers for deletion (commonly using roulette wheel selection). An attractive regular at his roulette wheel believes he can control where the ball falls. The outcomes of a perfectly balanced roulette wheel are a good example of common-cause variation. During Series One, only one pre-recorded sound effect was used, that of a roulette wheel. In 1926, Cavanagh lost $22,000 in one evening on a roulette wheel in Monte Carlo. Other contraptions included the Human Roulette Wheel, Earthquake Stairway, Dew Drop, Whichway, and Wedding Ring.