Horseshoe nail holes and paper machine: what they have in common

1. Step 1. Horseshoe nail holes — is part of — Horseshoe. Horseshoe nails fix the shoe.
2. Step 2. Horseshoe — is made of — Iron. Iron.
3. Step 3. Iron — is material for — Bucket elevator. On an iron chain.
4. Step 4. Bucket elevator — works like — Conveyor belt. A conveyor with buckets that lifts goods vertically.
5. Step 5. Conveyor belt — works like — Paper machine. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.

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