Vessel with an outflow hole and davy lamp: what they have in common

1. Step 1. Vessel with an outflow hole — is part of — Water clock (clepsydra). Water flows out at a nearly constant rate.
2. Step 2. Water clock (clepsydra) — is made of — Stone. The clepsydra from Karnak is a stone vessel.
3. Step 3. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).
4. Step 4. Oil lamp — has part — Wick. The wick feeds oil to the flame.
5. Step 5. Wick — is part of — Davy lamp. A wick.

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