"Roulette is played on a large table which is printed with a betting layout. At one end of the table, a wheel encased in a wooden cylinder turns on a central spindle. The wheel is divided into 38 sections numbered from zero to 36 inclusive, plus a section numbered double zero (00).
Consecutive numbers are arranged opposite each other on the wheel. Each number is colored either red or black and the zeros are colored green.
The aim of roulette is to predict the number on which a ball spun around the wooden cylinder will land. The ball is spun by hand by a dealer and must make at least three revolutions before dropping into one of the numbered sections on the wheel..."
For more information, check out Belinda Levez's The Casino Handbook!
-Levez, Belinda. The Casino Handbook. New York: Barnes and Noble, 2001.