Cotton gin and bellows: what they have in common

1. Step 1. Cotton gin — uses — Interchangeable parts. Whitney was one of the promoters of interchangeable parts.
2. Step 2. Interchangeable parts — works like — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
3. Step 3. Movable type — evolved into — Linotype. Mechanized typesetting.
4. Step 4. Linotype — has part — Keyboard. A keyboard.
5. Step 5. Keyboard — is part of — Pipe organ. Manuals were the first keyboards.
6. Step 6. Pipe organ — has part — Bellows. Bellows supply the air.

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