Tweezer arms and hollerith tabulator: what they have in common

1. Step 1. Tweezer arms — is part of — Surgical forceps. Two springy legs.
2. Step 2. Surgical forceps — is made of — Bronze. Roman surgical forceps were bronze.
3. Step 3. Bronze — is material for — Carillon. Carillon bells are cast in bronze.
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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