Autopilot and rock drill: what they have in common

1. Step 1. Autopilot — has part — Gyroscope. Sperry’s gyroscopes.
2. Step 2. Gyroscope — is part of — Torpedo. Obry’s gyroscope keeps the course.
3. Step 3. Torpedo — uses — Compressed air. The first torpedoes ran on compressed air.
4. Step 4. Compressed air — is used in — Rock drill. Pneumatics.

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