What Harvard Mark I is made of

Howard Aiken’s electromechanical programmable computer.

• Relay — has part. The Mark I was electromechanical, built from relays.
• Punched card — uses. The program was read from punched tape and the data from punched cards.
• Steel — is made of. The case is steel and glass.
• Copper — is made of. 800 km of wiring.

Harvard Mark I

Open Evothings