Sextant und paper machine: was sie gemeinsam haben
- Schritt 1. Sextant — nutzt — Reflection of light. Double reflection brings the celestial body and the horizon together.
- Schritt 2. Reflection of light — wird verwendet in — Photometer. Brightness is judged from reflected light.
- Schritt 3. Photometer — ist hergestellt aus — Paper. A photometer compares the illumination of paper screens.
- Schritt 4. Paper — nutzt — Paper machine. Industrial production.