Zhang Heng’s seismoscope und saw: was sie gemeinsam haben

1. Schritt 1. Zhang Heng’s seismoscope — nutzt — Pendulum. An internal pendulum (according to reconstructions).
2. Schritt 2. Pendulum — nutzt — Universal gravitation. The restoring force is gravity.
3. Schritt 3. Universal gravitation — wird verwendet in — Gravity flow. It flows downhill under gravity.
4. Schritt 4. Gravity flow — wird verwendet in — Water wheel. Falling or flowing water turns the wheel.
5. Schritt 5. Water wheel — ist Teil von — Sawmill. Early sawmills were driven by water wheels.
6. Schritt 6. Sawmill — nutzt — Saw. The cutting tool is a saw.

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