Sailing ship and aeroplane: what they have in common

1. Step 1. Sailing ship — has part — Compass. A magnetic compass.
2. Step 2. Compass — evolved into — Gyrocompass. A compass without a magnet.
3. Step 3. Gyrocompass — is part of — Ironclad. Steel ships distort a magnetic compass.
4. Step 4. Ironclad — evolved into — Aircraft carrier. The first aircraft carriers were converted from battleships and cruisers.
5. Step 5. Aircraft carrier — uses — Aeroplane. Basing aircraft.

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