Glass tube und mechanical clock: was sie gemeinsam haben

1. Schritt 1. Glass tube — ist Teil von — Barometer. A tube sealed at the top.
2. Schritt 2. Barometer — ist Teil von — Weather station. A barometer.
3. Schritt 3. Weather station — nutzt — Euclidean geometry. Instruments are set up on a site according to a standard.
4. Schritt 4. Euclidean geometry — wird verwendet in — Sundial. The scale is marked by the angle of the shadow.
5. Schritt 5. Sundial — funktioniert wie — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
6. Schritt 6. Water clock (clepsydra) — entwickelte sich zu — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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