Woofer speaker driver and turbojet engine: what they have in common

1. Step 1. Woofer speaker driver — is part of — Subwoofer. A loudspeaker with a large cone.
2. Step 2. Subwoofer — has part — Permanent magnet. A magnet system moves the cone.
3. Step 3. Permanent magnet — is part of — Magnetron. A magnet makes the electrons spiral.
4. Step 4. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.
5. Step 5. Radar — is part of — Jet fighter. A radar.
6. Step 6. Jet fighter — has part — Turbojet engine. A turbojet.

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