Press columns and sonar: what they have in common

1. Step 1. Press columns — is part of — Forging press. Columns and crossbeams.
2. Step 2. Forging press — evolved from — Steam hammer. Pressing instead of striking.
3. Step 3. Steam hammer — has part — Boiler. A boiler supplies the steam.
4. Step 4. Boiler — is part of — Steam turbine. Steam from the boiler.
5. Step 5. Steam turbine — is part of — Destroyer. Turbines.
6. Step 6. Destroyer — has part — Sonar. Underwater acoustics.

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