Today, slot machines generate over 70% of all casino revenue worldwide, dominating the floors with massive screens and loud music.

From clunky cast-iron contraptions to highly advanced digital computers, the core appeal of pulling the lever has never changed.

The Mechanical Era: The Birth of the Liberty Bell

Before the Liberty Bell, gambling machines required a bartender to manually hand over a prize, like a free beer or a cigar.

Fey's brilliant design used three physical metal reels painted with symbols like horseshoes, diamonds, spades, and a cracked Liberty Bell.

• These early machines were entirely mechanical; pulling the heavy side lever actually stretched a physical spring that spun the reels
• The physical lever is why slot machines earned the famous nickname 'One-Armed Bandits'
• Fey's original three-reel design was so perfect that it remained the absolute industry standard for over seventy years

How Technology Changed the Slot Machine Forever

The entire industry changed in 1976 when a Las Vegas company called Fortune Coin introduced the very first video slot machine.

However, the introduction of the Random Number Generator (RNG) microchip proved that the digital games were completely fair and random.

Charles Fey's simple mechanical invention laid the foundation for a multi-billion dollar global entertainment empire.