Dental X-ray and diesel engine: what they have in common

1. Step 1. Dental X-ray — uses — Photographic film. The image is on film.
2. Step 2. Photographic film — is used in — Cinématographe. Perforated film.
3. Step 3. Cinématographe — has part — Crank. The film was advanced by turning a handle.
4. Step 4. Crank — is part of — Reaper. A crank moves the knife.
5. Step 5. Reaper — evolved into — Combine harvester. Reaper + thresher.
6. Step 6. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.

Open Evothings