Grain hopper and voltaic pile: what they have in common

1. Step 1. Grain hopper — is part of — Gristmill. A hopper feeds the grain evenly.
2. Step 2. Gristmill — uses — Water wheel. A water wheel turns the millstones.
3. Step 3. Water wheel — uses — Gravity flow. Falling or flowing water turns the wheel.
4. Step 4. Gravity flow — is used in — Gutter. Drainage.
5. Step 5. Gutter — is made of — Zinc. Galvanized steel.
6. Step 6. Zinc — is material for — Voltaic pile. The pile is discs of zinc.

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