Bell body and centrifugal pump: what they have in common

1. Step 1. Bell body — is part of — Bell. A cast body that rings when struck.
2. Step 2. Bell — is part of — Tower clock. The chime of the clock.
3. Step 3. Tower clock — has part — Escapement. An escapement sets the pace.
4. Step 4. Escapement — uses — Universal gravitation. The pace of the clock is set by a falling weight.
5. Step 5. Universal gravitation — is used in — Water tower. Pressure from height.
6. Step 6. Water tower — has part — Centrifugal pump. Filled by pumps.

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