Codex (book) and tunnelling shield: what they have in common

1. Step 1. Codex (book) — is made of — Paper. Later ones were made of paper.
2. Step 2. Paper — uses — Paper machine. Industrial production.
3. Step 3. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.
4. Step 4. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
5. Step 5. Tunnel boring machine — evolved from — Tunnelling shield. A development of the tunnelling shield.

Open Evothings