Supersonic airliner and hammer: what they have in common

1. Step 1. Supersonic airliner — has part — Turbojet engine. Turbojet engines.
2. Step 2. Turbojet engine — has part — Turbine. The turbine drives the compressor.
3. Step 3. Turbine — evolved from — Water wheel. The water turbine evolved from the water wheel.
4. Step 4. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
5. Step 5. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.

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