Sextant and paper machine: what they have in common

1. Step 1. Sextant — uses — Reflection of light. Double reflection brings the celestial body and the horizon together.
2. Step 2. Reflection of light — is used in — Photometer. Brightness is judged from reflected light.
3. Step 3. Photometer — is made of — Paper. A photometer compares the illumination of paper screens.
4. Step 4. Paper — uses — Paper machine. Industrial production.

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