Balance beam et telescope : ce qu'ils ont en commun

1. Étape 1. Balance beam — fait partie de — Shaduf. A long pole acting as a lever.
2. Étape 2. Shaduf — utilise — Lever. A shaduf is a lever with a counterweight.
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.

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