Sliding transom and electric motor: what they have in common

1. Step 1. Sliding transom — is part of — Jacob’s staff. A movable arm for measuring the angle.
2. Step 2. Jacob’s staff — works like — Quadrant. Two angle gauges for measuring the altitude of celestial bodies.
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 used in — Cable car. A steel rope pulls and holds a cable car's cabins.
6. Step 6. Cable car — has part — Electric motor. The drive.

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