Oil pumpjack and kiln: what they have in common

1. Step 1. Oil pumpjack — is part of — Oil well. It drives the sucker-rod pump.
2. Step 2. Oil well — is made of — Wrought iron. The casing pipes are iron.
3. Step 3. Wrought iron — is material for — Steam locomotive. The boiler is wrought iron.
4. Step 4. Steam locomotive — has part — Chimney. Smoke from the firebox leaves through the locomotive's chimney.
5. Step 5. Chimney — is part of — Kiln. The chimney creates a draught.

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