Ballast weights and camera: what they have in common

1. Step 1. Ballast weights — is part of — Diving bell. It sinks the bell.
2. Step 2. Diving bell — evolved into — Diving suit. Individual equipment.
3. Step 3. Diving suit — has part — Piston pump. Air was pumped from the surface.
4. Step 4. Piston pump — has part — Piston. The piston draws in and pushes out liquid.
5. Step 5. Piston — is part of — Bubble chamber. It releases pressure.
6. Step 6. Bubble chamber — has part — Camera. Photographing the tracks.

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