Balance beam und telescope: was sie gemeinsam haben

1. Schritt 1. Balance beam — ist Teil von — Shaduf. A long pole acting as a lever.
2. Schritt 2. Shaduf — nutzt — Lever. A shaduf is a lever with a counterweight.
3. Schritt 3. Lever — wird verwendet in — Optical telegraph. The arms were moved by a system of levers and rods.
4. Schritt 4. Optical telegraph — nutzt — Telescope. Signals were read through a telescope.

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