Rifling and hollerith tabulator: what they have in common

1. Step 1. Rifling — is part of — Revolver. A rifled barrel.
2. Step 2. Revolver — uses — Gunpowder. Gunpowder propels the bullet.
3. Step 3. Gunpowder — is used in — Fire lance. A gunpowder charge.
4. Step 4. Fire lance — is made of — Paper. The barrel of a fire lance is a paper or bamboo tube.
5. Step 5. Paper — is material for — Punched card. Punched cards are stiff card.
6. Step 6. Punched card — is used in — Hollerith tabulator. The 1890 census data was encoded on punched cards.

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