Casino history lives in the objects people handled: cards, roulette wheels, and...

https://www.historyfiles.co.uk/support/historyES431-Cards-Wheels-and-Reels.htm

Casino history lives in the objects people handled: cards, roulette wheels, and slot reels. The shift from single-zero to double-zero wheels shows how a small mechanical change could shape play, odds, and the experience of a night at the tables.