Wick and optical telegraph: what they have in common

1. Step 1. Wick — is part of — Oil lamp. The wick feeds oil to the flame.
2. Step 2. Oil lamp — is used in — Magic lantern. The light source is an oil lamp.
3. Step 3. Magic lantern — has part — Lens. Lenses.
4. Step 4. Lens — is used in — Optical telegraph. Signals were read through telescopes.

Open Evothings