Soda siphon and hollerith tabulator: what they have in common

1. Step 1. Soda siphon — has part — Valve. A valve.
2. Step 2. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
3. Step 3. Bellows — is part of — Barrel organ. Bellows feed air into the pipes.
4. Step 4. Barrel organ — has part — Pinned cylinder. A pinned cylinder sets the tune.
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.

Open Evothings