Lime and voltaic pile: what they have in common

1. Step 1. Lime — is material for — Cistern. The walls were coated with lime plaster against leaks.
2. Step 2. Cistern — uses — Gutter. Water is collected from roofs and squares.
3. Step 3. Gutter — is made of — Zinc. Galvanized steel.
4. Step 4. Zinc — is material for — Voltaic pile. The pile is discs of zinc.

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