Handle wedge and sonar: what they have in common

1. Step 1. Handle wedge — is part of — Hammer. It wedges the handle in the eye.
2. Step 2. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
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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