Sextant e paper machine: o que têm em comum

1. Passo 1. Sextant — utiliza — Reflection of light. Double reflection brings the celestial body and the horizon together.
2. Passo 2. Reflection of light — é utilizado em — Photometer. Brightness is judged from reflected light.
3. Passo 3. Photometer — é feito de — Paper. A photometer compares the illumination of paper screens.
4. Passo 4. Paper — utiliza — Paper machine. Industrial production.

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