Water clock (clepsydra) und sickle: was sie gemeinsam haben

1. Schritt 1. Water clock (clepsydra) — nutzt — Gravity flow. Water flows out at a constant rate under gravity.
2. Schritt 2. Gravity flow — wird verwendet in — Water wheel. Falling or flowing water turns the wheel.
3. Schritt 3. Water wheel — wird verwendet in — Gristmill. A water wheel turns the millstones.
4. Schritt 4. Gristmill — nutzt — Grain. A mill grinds grain.
5. Schritt 5. Grain — wird verwendet in — Sickle. Cereals were reaped with a sickle.

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