Tuning fork prongs e heron’s aeolipile: o que têm em comum

1. Passo 1. Tuning fork prongs — faz parte de — Tuning fork. Two vibrating tines.
2. Passo 2. Tuning fork — faz parte de — Quartz clock. Quartz shaped like a tuning fork at 32,768 Hz.
3. Passo 3. Quartz clock — evoluiu de — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
4. Passo 4. Mechanical clock — faz parte de — Parking meter. A clock mechanism.
5. Passo 5. Parking meter — evoluiu de — Vending machine. A payment machine.
6. Passo 6. Vending machine — foi inspirado por — Heron’s aeolipile. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.

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