Database and bellows: what they have in common

1. Step 1. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
2. Step 2. Hollerith tabulator — uses — Punched card. The 1890 census data was encoded on punched cards.
3. Step 3. Punched card — works like — Pinned cylinder. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
4. Step 4. Pinned cylinder — is part of — Barrel organ. A pinned cylinder sets the tune.
5. Step 5. Barrel organ — has part — Bellows. Bellows feed air into the pipes.

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