Corrugated steel walls and vacuum pump: what they have in common

1. Step 1. Corrugated steel walls — is part of — Shipping container. Steel panels.
2. Step 2. Shipping container — is used in — Container ship. Carries standard containers.
3. Step 3. Container ship — has part — Diesel engine. A slow-speed diesel.
4. Step 4. Diesel engine — has part — Cylinder. Cylinders.
5. Step 5. Cylinder — is part of — Piston pump. The piston moves in a cylinder.
6. Step 6. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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