Relógio atômico e hammer: o que têm em comum

1. Passo 1. Relógio atômico — evoluiu de — Quartz clock. The quartz oscillator is tuned to an atomic standard.
2. Passo 2. Quartz clock — evoluiu de — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
3. Passo 3. Mechanical clock — evoluiu de — Water clock (clepsydra). Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
4. Passo 4. Water clock (clepsydra) — é feito de — Stone. The clepsydra from Karnak is a stone vessel.
5. Passo 5. Stone — é material para — Hammer. The first hammer was a hammerstone, later mounted on a handle.

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