Torpedo and needle: what they have in common

1. Step 1. Torpedo — has part — Gyroscope. Obry’s gyroscope keeps the course.
2. Step 2. Gyroscope — works like — Spinning top. A gyroscope is a top in a gimbal.
3. Step 3. Spinning top — has part — Sharp point. A fulcrum.
4. Step 4. Sharp point — is part of — Needle. It pierces the fabric.

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