Door closer and paper machine: what they have in common

1. Step 1. Door closer — uses — Hydraulics (Pascal’s law). Hydraulic damping.
2. Step 2. Hydraulics (Pascal’s law) — is used in — Hydraulic cylinder. The liquid transmits pressure to the piston.
3. Step 3. Hydraulic cylinder — is part of — Tunnel boring machine. Hydraulic cylinders push the machine forward.
4. Step 4. Tunnel boring machine — has part — Conveyor belt. Spoil is removed by a conveyor.
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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