Truss bridge and gutenberg printing press: what they have in common

1. Step 1. Truss bridge — uses — Railway track. Railway bridges.
2. Step 2. Railway track — is used in — Model railway. It runs on rails.
3. Step 3. Model railway — is made of — Tin. The first models were tinplate.
4. Step 4. Tin — is used in — Linotype. A line is cast from type metal (lead, tin, antimony).
5. Step 5. Linotype — evolved from — Movable type. Mechanized typesetting.
6. Step 6. Movable type — is part of — Gutenberg printing press. Text is set from metal type.

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