Security camera and jacquard loom: what they have in common

1. Step 1. Security camera — has part — Monitor. A guard watches the camera feed on a monitor.
2. Step 2. Monitor — has part — Cathode-ray tube. The first monitors were CRTs.
3. Step 3. Cathode-ray tube — is a kind of — Vacuum tube. An electron vacuum device.
4. Step 4. Vacuum tube — is part of — ENIAC. ENIAC contained about 18,000 vacuum tubes.
5. Step 5. ENIAC — uses — Punched card. ENIAC’s input and output went through IBM punched-card equipment.
6. Step 6. Punched card — is used in — Jacquard loom. Each punched card sets one pass of the pattern.

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