Ferris wheel and davy lamp: what they have in common

1. Step 1. Ferris wheel — works like — Bicycle wheel. A giant wheel with spokes in tension.
2. Step 2. Bicycle wheel — is made of — Vulcanized rubber. The tyre is rubber.
3. Step 3. Vulcanized rubber — is material for — Footwear. A rubber sole.
4. Step 4. Footwear — is made of — Plant fibre. The oldest sandals (Fort Rock) were woven from sagebrush bark.
5. Step 5. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
6. Step 6. Wick — is part of — Davy lamp. A wick.

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