Permanent magnet and tunnelling shield: what they have in common

1. Step 1. Permanent magnet — is part of — Magnetron. A magnet makes the electrons spiral.
2. Step 2. Magnetron — is part of — Radar. The cavity magnetron made compact radar possible.
3. Step 3. Radar — is used in — Airport. Radars.
4. Step 4. Airport — has part — Jet bridge. Jet bridges.
5. Step 5. Jet bridge — has part — Hydraulic cylinder. Raising the bridge.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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