Vessel with an outflow hole and turbine: what they have in common

1. Step 1. Vessel with an outflow hole — is part of — Water clock (clepsydra). Water flows out at a nearly constant rate.
2. Step 2. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
3. Step 3. Mechanical clock — is part of — Parking meter. A clock mechanism.
4. Step 4. Parking meter — evolved from — Vending machine. A payment machine.
5. Step 5. Vending machine — was inspired by — Heron’s aeolipile. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.
6. Step 6. Heron’s aeolipile — evolved into — Turbine. The aeolipile is the oldest ancestor of the steam turbine.

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