Air supply hose and internal combustion engine: what they have in common

1. Step 1. Air supply hose — is part of — Diving bell. It replenishes the air (Halley).
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 — Cylinder. The piston moves in a cylinder.
5. Step 5. Cylinder — is part of — Internal combustion engine. Combustion takes place in the cylinders.

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