Clear polycarbonate disc and conveyor belt: what they have in common

1. Step 1. Clear polycarbonate disc — is part of — DVD. Two halves glued together with tracks.
2. Step 2. DVD — evolved from — Video recorder. A replacement for video cassettes.
3. Step 3. Video recorder — has part — Magnetic tape. Video tape.
4. Step 4. Magnetic tape — is made of — Paper. Pfleumer’s first tape was paper coated with magnetic powder.
5. Step 5. Paper — uses — Paper machine. Industrial production.
6. Step 6. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.

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