Alphabet and steam turbine: what they have in common

1. Step 1. Alphabet — is used in — Movable type. An alphabet with few signs made typesetting worthwhile in Europe.
2. Step 2. Movable type — is part of — Gutenberg printing press. Text is set from metal type.
3. Step 3. Gutenberg printing press — evolved into — Rotary printing press. Cylinders instead of a flat press.
4. Step 4. Rotary printing press — has part — Watt steam engine. The first rotary presses were steam-driven.
5. Step 5. Watt steam engine — evolved into — Steam turbine. The turbine replaced piston engines in large installations.

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