Water turbine and bell: what they have in common

1. Step 1. Water turbine — uses — Gravity flow. It is turned by falling water.
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.
4. Step 4. Mechanical clock — includes — Alarm clock. A clock.
5. Step 5. Alarm clock — has part — Bell. A bell rings.

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