De quoi est fait hollerith tabulator
An electromechanical machine for processing census data from punched cards.
- Punched card reading press — a pour partie. Needles pass through the holes and close the circuit in mercury.
- Electromechanical dial counters — a pour partie. Dials that count the pulses.
- Relay — a pour partie. Relays controlled the sorting box.
- Punched card — utilise. The 1890 census data was encoded on punched cards.
- Électromagnétisme — utilise. The counters click with electromagnets.
- Fonte — est fait de. The casing is cast iron.
- Cuivre — est fait de. The contacts are copper pins dipping into mercury.