Weight plates and voltaic pile: what they have in common

1. Step 1. Weight plates — is part of — Dumbbell. Weights.
2. Step 2. Dumbbell — is made of — Stone. Greek halteres were stone dumbbells.
3. Step 3. Stone — is material for — Gutter. Ancient gutters were stone or ceramic channels.
4. Step 4. Gutter — is made of — Zinc. Galvanized steel.
5. Step 5. Zinc — is material for — Voltaic pile. The pile is discs of zinc.

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