Mother well shaft and lead–acid battery: what they have in common

1. Step 1. Mother well shaft — is part of — Qanat. A vertical shaft down to the aquifer.
2. Step 2. Qanat — uses — Gravity flow. Water flows by gravity.
3. Step 3. Gravity flow — is used in — Gutter. Drainage.
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.
6. Step 6. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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