Pneumatic tube pipe and boiler: what they have in common

1. Step 1. Pneumatic tube pipe — is part of — Pneumatic tube. A network of tubes between stations.
2. Step 2. Pneumatic tube — uses — Compressed air. Air pressure.
3. Step 3. Compressed air — is used in — Torpedo. The first torpedoes ran on compressed air.
4. Step 4. Torpedo — is part of — Destroyer. Torpedoes.
5. Step 5. Destroyer — has part — Steam turbine. Turbines.
6. Step 6. Steam turbine — has part — Boiler. Steam from the boiler.

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