Magnifier frame with handle und optical telegraph: was sie gemeinsam haben

1. Schritt 1. Magnifier frame with handle — ist Teil von — Magnifying glass. A frame with a handle.
2. Schritt 2. Magnifying glass — entwickelte sich zu — Brille. Reading stones — magnifying lenses — preceded glasses.
3. Schritt 3. Brille — entwickelte sich zu — Telescope. The first telescopes were assembled by spectacle makers.
4. Schritt 4. Telescope — wird verwendet in — Optical telegraph. Signals were read through a telescope.

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