Injection moulding and modem: what they have in common

1. Step 1. Injection moulding — uses — Hydraulics (Pascal’s law). Hydraulic presses.
2. Step 2. Hydraulics (Pascal’s law) — is used in — Door closer. Hydraulic damping.
3. Step 3. Door closer — has part — Spring. A spring.
4. Step 4. Spring — is part of — Rotary dial. A return spring.
5. Step 5. Rotary dial — is part of — Telephone. A dial.
6. Step 6. Telephone — is used in — Modem. It works over a telephone line.

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