Tower clock movement and hollerith tabulator: what they have in common

1. Step 1. Tower clock movement — is part of — Tower clock. A wheel train with weights.
2. Step 2. Tower clock — has part — Bell. The chime of the clock.
3. Step 3. Bell — is part of — Carillon. Bells.
4. Step 4. Carillon — has part — Pinned cylinder. Automatic carillons have a pinned drum.
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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