Lead plates and gyroscope: what they have in common

1. Step 1. Lead plates — is part of — Lead–acid battery. Negative electrodes.
2. Step 2. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
3. Step 3. Submarine — has part — Torpedo. Torpedo armament.
4. Step 4. Torpedo — has part — Gyroscope. Obry’s gyroscope keeps the course.

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