Stopwatch crown button and hollerith tabulator: what they have in common

1. Step 1. Stopwatch crown button — is part of — Stopwatch. A cam starts and resets the hand.
2. Step 2. Stopwatch — has part — Mainspring. A mainspring.
3. Step 3. Mainspring — is part of — Music box. A mainspring turns the cylinder.
4. Step 4. Music box — has part — Pinned cylinder. The cylinder’s pins pluck the teeth of the comb.
5. Step 5. Pinned cylinder — works like — Punched card. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
6. Step 6. Punched card — is used in — Hollerith tabulator. The 1890 census data was encoded on punched cards.

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