Track circuit and conveyor belt: what they have in common

1. Step 1. Track circuit — has part — Relay. Track relays.
2. Step 2. Relay — is part of — Harvard Mark I. The Mark I was electromechanical, built from relays.
3. Step 3. Harvard Mark I — uses — Punched card. The program was read from punched tape and the data from punched cards.
4. Step 4. Punched card — is made of — Paper. Punched cards are stiff card.
5. Step 5. Paper — uses — Paper machine. Industrial production.
6. Step 6. Paper machine — works like — Conveyor belt. Fourdrinier’s endless wire mesh moves like a conveyor belt, forming the web of paper.

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