Spoke and gas lamp: what they have in common

1. Step 1. Spoke — is part of — Umbrella. Ribs hold the canopy.
2. Step 2. Umbrella — is made of — Silk. The canopy is made of silk.
3. Step 3. Silk — is material for — Hot air balloon. The Montgolfier balloon was fabric lined with paper.
4. Step 4. Hot air balloon — has part — Gas burner. It heats the air in the envelope with a propane flame.
5. Step 5. Gas burner — is part of — Gas lamp. A coal-gas burner.

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