Parchment and micrometer: what they have in common

1. Step 1. Parchment — is material for — Codex (book). Early codices were made of parchment.
2. Step 2. Codex (book) — is used in — Gutenberg printing press. The press printed sheets that were bound into codex books.
3. Step 3. Gutenberg printing press — has part — Movable type. Text is set from metal type.
4. Step 4. Movable type — works like — Interchangeable parts. Movable type is an early case of interchangeable parts: identical letters move from line to line.
5. Step 5. Interchangeable parts — uses — Micrometer. Precise measurement ensures interchangeability.

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