Brine-soaked cloth discs and submarine: what they have in common

1. Step 1. Brine-soaked cloth discs — is part of — Voltaic pile. Cloth soaked in brine.
2. Step 2. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
3. Step 3. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.

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