Cards, roulette wheels and slot reels hold clues to casino history. This...

https://wiki-cable.win/index.php/Slot_Reels_and_the_Viewing_Window:_Why_That_Frame_Matters

Cards, roulette wheels and slot reels hold clues to casino history. This article follows their changing designs, from a San Francisco workshop in 1895 to the lasting difference between single-zero and double-zero roulette.