Blacksmith’s tongs und mechanical clock: was sie gemeinsam haben
- Schritt 1. Blacksmith’s tongs — hat als Teil — Pivot joint. The pivot of the halves.
- Schritt 2. Pivot joint — ist Teil von — Zirkel. The pivot of the opening.
- Schritt 3. Zirkel — wird verwendet in — Euclidean geometry. Constructions with compass and straightedge.
- Schritt 4. Euclidean geometry — wird verwendet in — Sundial. The scale is marked by the angle of the shadow.
- Schritt 5. Sundial — funktioniert wie — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
- Schritt 6. Water clock (clepsydra) — entwickelte sich zu — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.