Cinema and radar: what they have in common

1. Step 1. Cinema — uses — Cinématographe. Cinema began with the cinématographe.
2. Step 2. Cinématographe — uses — Photographic film. Perforated film.
3. Step 3. Photographic film — is used in — X-ray machine. An image on film.
4. Step 4. X-ray machine — has part — Vacuum tube. An X-ray tube.
5. Step 5. Vacuum tube — includes — Magnetron. An electron vacuum device.
6. Step 6. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.

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