Galvanization and tank: what they have in common

1. Step 1. Galvanization — is made of — Zinc. A zinc coating.
2. Step 2. Zinc — is material for — Voltaic pile. The pile is discs of zinc.
3. Step 3. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
4. Step 4. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
5. Step 5. Submarine — has part — Periscope. A periscope.
6. Step 6. Periscope — is part of — Tank. Observation devices.

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