Seaplane and electrical telegraph: what they have in common

1. Step 1. Seaplane — has part — Wing. An aeroplane with wings.
2. Step 2. Wing — is part of — Jet airliner. A swept wing.
3. Step 3. Jet airliner — has part — Radar. A weather radar.
4. Step 4. Radar — includes — Doppler radar. A radar.
5. Step 5. Doppler radar — is used in — Weather forecast. Weather radars.
6. Step 6. Weather forecast — uses — Electrical telegraph. Collecting reports by telegraph.

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