Knotted log line und refrigerator: was sie gemeinsam haben

1. Schritt 1. Knotted log line — ist Teil von — Chip log. A knotted rope.
2. Schritt 2. Chip log — nutzt — Hourglass. The time of a speed measurement was taken with an hourglass.
3. Schritt 3. Hourglass — funktioniert wie — Water clock (clepsydra). The same principle of timing by outflow, with sand instead of water.
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 — Ice house. Ice houses were built of stone and sunk into the ground.
6. Schritt 6. Ice house — entwickelte sich zu — Refrigerator. The refrigerator replaced natural ice.

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