Gamma camera and jacquard loom: what they have in common

1. Step 1. Gamma camera — has part — Photodiode. Photodetectors for scintillations.
2. Step 2. Photodiode — is a kind of — Diode. A kind of diode.
3. Step 3. Diode — evolved from — Vacuum tube. The first diode was a vacuum tube (Fleming); later diodes became semiconductor devices.
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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