Draft pole and gas lamp: what they have in common

1. Step 1. Draft pole — is part of — Yoke. It transfers the pull to the plough or cart.
2. Step 2. Yoke — is a kind of — Horse collar. A harness for oxen.
3. Step 3. Horse collar — is made of — Leather. The collar and traces are leather.
4. Step 4. Leather — is material for — Bellows. Bellows are a leather bag.
5. Step 5. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
6. Step 6. Valve — is part of — Gas lamp. A gas supply valve.

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