Höhenmesser und tunnelling shield: was sie gemeinsam haben

1. Schritt 1. Höhenmesser — entwickelte sich aus — Barometer. An altimeter is a barometer with an altitude scale.
2. Schritt 2. Barometer — funktioniert wie — Manometer. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
3. Schritt 3. Manometer — nutzt — Hydraulics (Pascal’s law). A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
4. Schritt 4. Hydraulics (Pascal’s law) — wird verwendet in — Hydraulic cylinder. The liquid transmits pressure to the piston.
5. Schritt 5. Hydraulic cylinder — wird verwendet in — Tunnelling shield. The shield was pushed forward by jacks.

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