Magnifier frame with handle and optical telegraph: what they have in common

1. Step 1. Magnifier frame with handle — is part of — Magnifying glass. A frame with a handle.
2. Step 2. Magnifying glass — evolved into — Glasses. Reading stones — magnifying lenses — preceded glasses.
3. Step 3. Glasses — evolved into — Telescope. The first telescopes were assembled by spectacle makers.
4. Step 4. Telescope — is used in — Optical telegraph. Signals were read through a telescope.

Open Evothings