Mortar bipod and voltaic pile: what they have in common

1. Step 1. Mortar bipod — is part of — Mortar (weapon). Elevation laying.
2. Step 2. Mortar (weapon) — uses — Universal gravitation. The bomb flies on a steep trajectory.
3. Step 3. Universal gravitation — is used in — Gravity flow. It flows downhill under gravity.
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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