Steam carriage and typewriter: what they have in common

1. Step 1. Steam carriage — has part — Watt steam engine. The steam engine.
2. Step 2. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
3. Step 3. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
4. Step 4. Gutenberg printing press — has part — Movable type. Text is set from metal type.
5. Step 5. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

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