Because vending machines are now automated, they feel like a relatively modern invention. However, the basic contraption has been around for more than 2,000 years. Introduced in the first century CE by Greek engineer and mathematician Heron of Alexandria, the first vending machine dispensed holy water, to stop thievery. Similar to modern machines, his device required inserting a coin into a slot. The coin fell onto a pan connected to a lever, which opened a valve on the other end where the holy water flowed out. The pan continued to move under the weight of the coin until the coin slid off. The lever would then raise back to its initial state and close the valve, stopping the flow of water.
More information about Heron's inventions
Image: "NIND holywater ISOH1" by Trougnouf (Benoit Brummer) is licensed under CC BY 4.0.
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