Sighting vanes and elevator: what they have in common

1. Step 1. Sighting vanes — is part of — Quadrant. A sight for the celestial body.
2. Step 2. Quadrant — has part — Plumb bob. A plumb line shows the vertical.
3. Step 3. Plumb bob — has part — Rope. A suspension fibre.
4. Step 4. Rope — is used in — Pulley. A rope runs over the pulley.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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