Limestone blocks et lunettes : ce qu'ils ont en commun

1. Étape 1. Limestone blocks — fait partie de — Egyptian pyramid. Limestone and granite blocks of masonry.
2. Étape 2. Egyptian pyramid — utilise — Lever. Levers were used to move the blocks.
3. Étape 3. Lever — est utilisé dans — Optical telegraph. The arms were moved by a system of levers and rods.
4. Étape 4. Optical telegraph — utilise — Telescope. Signals were read through a telescope.
5. Étape 5. Telescope — a évolué de — Lunettes. The first telescopes were assembled by spectacle makers.

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