Threshing machine and camera: what they have in common

1. Step 1. Threshing machine — evolved into — Combine harvester. Combining machines.
2. Step 2. Combine harvester — has part — Diesel engine. Self-propelled combines run on diesels.
3. Step 3. Diesel engine — has part — Piston. Pistons move in the cylinders.
4. Step 4. Piston — is part of — Bubble chamber. It releases pressure.
5. Step 5. Bubble chamber — has part — Camera. Photographing the tracks.

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