Magnifier frame with handle e optical telegraph: o que têm em comum

1. Passo 1. Magnifier frame with handle — faz parte de — Magnifying glass. A frame with a handle.
2. Passo 2. Magnifying glass — evoluiu para — Óculos. Reading stones — magnifying lenses — preceded glasses.
3. Passo 3. Óculos — evoluiu para — Telescope. The first telescopes were assembled by spectacle makers.
4. Passo 4. Telescope — é utilizado em — Optical telegraph. Signals were read through a telescope.

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