Caravel and submarine: what they have in common

1. Step 1. Caravel — has part — Compass. A magnetic compass.
2. Step 2. Compass — evolved into — Gyrocompass. A compass without a magnet.
3. Step 3. Gyrocompass — has part — Gyroscope. A gyroscope.
4. Step 4. Gyroscope — is part of — Torpedo. Obry’s gyroscope keeps the course.
5. Step 5. Torpedo — is part of — Submarine. Torpedo armament.

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