Attitude indicator and cannon: what they have in common

1. Step 1. Attitude indicator — has part — Gyroscope. A gyroscope.
2. Step 2. Gyroscope — is part of — Gyrocompass. A gyroscope.
3. Step 3. Gyrocompass — is part of — Ironclad. Steel ships distort a magnetic compass.
4. Step 4. Ironclad — has part — Cannon. Artillery.

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