Mortar (weapon) and electrical telegraph: what they have in common

1. Step 1. Mortar (weapon) — has part — Gun barrel. A smooth bore.
2. Step 2. Gun barrel — is part of — Anti-aircraft gun. A long barrel.
3. Step 3. Anti-aircraft gun — uses — Radar. Radar guidance.
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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