Paper machine and aeroplane: what they have in common

1. Step 1. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.
2. Step 2. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
3. Step 3. Tunnel boring machine — has part — Hydraulic cylinder. Hydraulic cylinders push the machine forward.
4. Step 4. Hydraulic cylinder — is part of — Retractable landing gear. Retraction cylinders.
5. Step 5. Retractable landing gear — is a kind of — Landing gear. Landing gear.
6. Step 6. Landing gear — is part of — Aeroplane. Landing gear.

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