Graduated wooden staff and electrical grid: what they have in common

1. Step 1. Graduated wooden staff — is part of — Jacob’s staff. A long bar with a scale.
2. Step 2. Jacob’s staff — works like — Quadrant. Two angle gauges for measuring the altitude of celestial bodies.
3. Step 3. Quadrant — uses — Universal gravitation. The angle is read against a plumb line.
4. Step 4. Universal gravitation — is used in — Hydroelectric power station. The energy of falling water.
5. Step 5. Hydroelectric power station — is a kind of — Power station. A kind of power station.
6. Step 6. Power station — is part of — Electrical grid. Power stations feed the grid.

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