Balestilha e rolling mill: o que têm em comum

1. Passo 1. Balestilha — funciona como — Quadrant. Two angle gauges for measuring the altitude of celestial bodies.
2. Passo 2. Quadrant — utiliza — Universal gravitation. The angle is read against a plumb line.
3. Passo 3. Universal gravitation — é utilizado em — Hydroelectric power station. The energy of falling water.
4. Passo 4. Hydroelectric power station — tem como parte — Water turbine. Water turbines.
5. Passo 5. Water turbine — evoluiu de — Water wheel. The turbine is a development of the water wheel.
6. Passo 6. Water wheel — é utilizado em — Rolling mill. The first mills were turned by water.

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