Atomuhr und hammer: was sie gemeinsam haben

1. Schritt 1. Atomuhr — entwickelte sich aus — Quartz clock. The quartz oscillator is tuned to an atomic standard.
2. Schritt 2. Quartz clock — entwickelte sich aus — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
3. Schritt 3. Mechanical clock — entwickelte sich aus — Water clock (clepsydra). Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
4. Schritt 4. Water clock (clepsydra) — ist hergestellt aus — Stone. The clepsydra from Karnak is a stone vessel.
5. Schritt 5. Stone — ist Material für — Hammer. The first hammer was a hammerstone, later mounted on a handle.

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