Yoke bows e newcomen engine: o que têm em comum

1. Passo 1. Yoke bows — faz parte de — Yoke. Bows that go around the animals’ necks.
2. Passo 2. Yoke — é utilizado em — Plough. It was pulled by oxen in a yoke.
3. Passo 3. Plough — evoluiu para — Steel plough. A steel share.
4. Passo 4. Steel plough — é utilizado em — Tractor. Ploughing with a tractor.
5. Passo 5. Tractor — evoluiu de — Watt steam engine. The first tractors were steam-powered.
6. Passo 6. Watt steam engine — evoluiu de — Newcomen engine. Watt improved Newcomen’s engine.

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