Water wheel and mechanical clock: what they have in common

1. Step 1. Water wheel — uses — Gravity flow. Falling or flowing water turns the wheel.
2. Step 2. Gravity flow — is used in — Water clock (clepsydra). Water flows out at a constant rate under gravity.
3. Step 3. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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