Water clock (clepsydra) and sickle: what they have in common

1. Step 1. Water clock (clepsydra) — uses — Gravity flow. Water flows out at a constant rate under gravity.
2. Step 2. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
3. Step 3. Water wheel — is used in — Gristmill. A water wheel turns the millstones.
4. Step 4. Gristmill — uses — Grain. A mill grinds grain.
5. Step 5. Grain — is used in — Sickle. Cereals were reaped with a sickle.

Open Evothings