Astrolabe mater and lathe: what they have in common

1. Step 1. Astrolabe mater — is part of — Astrolabe. The main disc with a scale.
2. Step 2. Astrolabe — evolved into — Quadrant. A simplified angle gauge.
3. Step 3. Quadrant — has part — Plumb bob. A plumb line shows the vertical.
4. Step 4. Plumb bob — has part — Rope. A suspension fibre.
5. Step 5. Rope — is part of — Lathe. The bowstring wraps around the workpiece and turns it.

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