Astrolabe plate and centrifugal pump: what they have in common

1. Step 1. Astrolabe plate — is part of — Astrolabe. A replaceable plate for the latitude.
2. Step 2. Astrolabe — evolved into — Quadrant. A simplified angle gauge.
3. Step 3. Quadrant — uses — Universal gravitation. The angle is read against a plumb line.
4. Step 4. Universal gravitation — is used in — Water tower. Pressure from height.
5. Step 5. Water tower — has part — Centrifugal pump. Filled by pumps.

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