Rover safety bicycle and davy lamp: what they have in common

1. Step 1. Rover safety bicycle — is made of — Vulcanized rubber. The tyres are rubber.
2. Step 2. Vulcanized rubber — is material for — Footwear. A rubber sole.
3. Step 3. Footwear — is made of — Plant fibre. The oldest sandals (Fort Rock) were woven from sagebrush bark.
4. Step 4. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
5. Step 5. Wick — is part of — Davy lamp. A wick.

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