Heron’s aeolipile and bell: what they have in common

1. Step 1. 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.
2. Step 2. Vending machine — evolved into — Parking meter. A payment machine.
3. Step 3. Parking meter — has part — Mechanical clock. A clock mechanism.
4. Step 4. Mechanical clock — includes — Alarm clock. A clock.
5. Step 5. Alarm clock — has part — Bell. A bell rings.

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