Space frame and voltaic pile: what they have in common

1. Step 1. Space frame — has part — Truss. Space trusses.
2. Step 2. Truss — is made of — Wrought iron. Then — wrought iron.
3. Step 3. Wrought iron — is material for — Ballast tank. The tanks are iron.
4. Step 4. Ballast tank — is part of — Submarine. Ballast tanks.
5. Step 5. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
6. Step 6. 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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