Jacob’s staff and rolling mill: what they have in common

1. Step 1. Jacob’s staff — works like — Quadrant. Two angle gauges for measuring the altitude of celestial bodies.
2. Step 2. Quadrant — uses — Universal gravitation. The angle is read against a plumb line.
3. Step 3. Universal gravitation — is used in — Hydroelectric power station. The energy of falling water.
4. Step 4. Hydroelectric power station — has part — Water turbine. Water turbines.
5. Step 5. Water turbine — evolved from — Water wheel. The turbine is a development of the water wheel.
6. Step 6. Water wheel — is used in — Rolling mill. The first mills were turned by water.

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