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Fact·Ancient Rome·Early Imperial Rome

Ancient Rome’s Holy Water Vending Machines

The first coin-operated machines were invented in Roman temples.

Ancient Rome’s Holy Water Vending Machines

Salvator Rosa — "The Dream of Aeneas" (1660–65), public domain

Drop a Coin for Holy Water

Step into a Roman temple and see a brass contraption. Slip in a tetradrachm, and—clunk—a measured splash of holy water pours out. This wasn’t magic, but tech: the world’s earliest vending machine.

Hero’s Ingenious Invention

Hero of Alexandria described it around 50 CE. His device worked by a lever: the coin's weight opened a valve, releasing water. Talk about automation—centuries before soda cans.

Romans could buy holy water from a device that dispensed a measured amount when a coin was dropped inside. The engineer Hero of Alexandria described this ingenious machine in the first century CE.

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