Air brake and voltaic pile: what they have in common

1. Step 1. Air brake — uses — Compressed air. The brake is controlled by air pressure in the train pipe.
2. Step 2. Compressed air — is used in — Ballast tank. The tanks are blown with compressed air.
3. Step 3. Ballast tank — is part of — Submarine. Ballast tanks.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
5. Step 5. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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