Clock dial and voltaic pile: what they have in common

1. Step 1. Clock dial — is part of — Sundial. A marked plane with hour lines.
2. Step 2. Sundial — works like — Water clock (clepsydra). Two ancient ways to measure time: by a shadow and by flowing water.
3. Step 3. Water clock (clepsydra) — uses — Gravity flow. Water flows out at a constant rate 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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