Plastic bottle and tunnelling shield: what they have in common

1. Step 1. Plastic bottle — uses — Injection moulding. Preforms are moulded and then blown.
2. Step 2. Injection moulding — uses — Hydraulics (Pascal’s law). Hydraulic presses.
3. Step 3. Hydraulics (Pascal’s law) — is used in — Hydraulic cylinder. The liquid transmits pressure to the piston.
4. Step 4. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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