Regulador centrífugo e stone tool: o que têm em comum

1. Passo 1. Regulador centrífugo — faz parte de — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.
2. Passo 2. Watt steam engine — tem como parte — Cilindro. Steam works in the cylinder.
3. Passo 3. Cilindro — faz parte de — Steam hammer. A steam cylinder.
4. Passo 4. Steam hammer — evoluiu de — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Passo 5. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.

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