Casino history comes into focus through objects: cards, roulette wheels, and...

https://juliet-wiki.win/index.php/San_Francisco%E2%80%99s_1895_slot-machine_story:_is_there_a_solid_source%3F

Casino history comes into focus through objects: cards, roulette wheels, and slot reels. Charles Fey’s 1895 Market Street workshop in San Francisco made slot machine history, while single-zero and double-zero wheels reveal how design shaped the odds.