Heliocentric system and davy lamp: what they have in common

1. Step 1. Heliocentric system — uses — Telescope. Galileo’s confirmations.
2. Step 2. Telescope — has part — Lens. An objective and an eyepiece.
3. Step 3. Lens — is part of — Magic lantern. Lenses.
4. Step 4. Magic lantern — uses — Oil lamp. The light source is an oil lamp.
5. Step 5. Oil lamp — has part — Wick. The wick feeds oil to the flame.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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