Brass samovar urn and payment card: what they have in common

1. Step 1. Brass samovar urn — is part of — Samovar. A container for water.
2. Step 2. Samovar — uses — Combustion. Charcoal in the chimney.
3. Step 3. Combustion — is used in — Heron’s aeolipile. A fire boils the water in the cauldron.
4. Step 4. Heron’s aeolipile — inspired — Vending machine. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.
5. Step 5. Vending machine — includes — ATM. A dispensing machine.
6. Step 6. ATM — uses — Payment card. It dispenses money for a card.

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