The slot machine is undeniably the most iconic and profitable symbol of the modern global casino industry.

Understanding this history allows you to truly appreciate the massive complexity hidden behind a modern digital ‘Spin’ button.

The Invention of the Liberty Bell (1894)

Before Fey’s invention, machines required a bartender to manually hand the winner a prize, usually a free drink or a cigar.

Fey’s brilliant, incredibly simple design featured three physical metal reels painted with standard playing card suits and a cracked bell.

• Because gambling was frequently outlawed, later machines were disguised as chewing gum dispensers to avoid police raids
• The classic ‘Fruit Symbols’ (cherries, lemons, plums) were introduced to represent the different flavors of gum the machines dispensed
• Fey notoriously refused to sell or license his patent, prompting massive competitors to simply reverse-engineer and copy his perfect design

The Electromechanical and Digital Revolutions

By utilizing electricity, Bally’s machine could feature a bottomless hopper, allowing for massive, multi-hundred coin payouts without a human attendant.

The introduction of the Random Number Generator (RNG) algorithm allowed software developers to create infinitely complex bonus rounds and massive progressive jackpots.

The slot machine is the perfect marriage of human behavioral psychology and cutting-edge digital engineering.