Glassblowing pipe and oil lamp: what they have in common

1. Step 1. Glassblowing pipe — is part of — Glassblowing. A hollow tube about a metre long.
2. Step 2. Glassblowing — is made of — Iron. A glassblowing pipe is iron.
3. Step 3. Iron — is material for — Davy lamp. The lamp’s gauze is iron.
4. Step 4. Davy lamp — has part — Wick. A wick.
5. Step 5. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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