Curved sickle blade e newcomen engine: o que têm em comum

1. Passo 1. Curved sickle blade — faz parte de — Sickle. A semicircular blade gathers the stems to the cut.
2. Passo 2. Sickle — evoluiu de — Stone tool. The first sickles had flint inserts.
3. Passo 3. Stone tool — evoluiu para — Hammer. The first hammer was a stone in the hand.
4. Passo 4. Hammer — evoluiu para — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Passo 5. Steam hammer — tem como parte — Caldeira. A boiler supplies the steam.
6. Passo 6. Caldeira — faz parte de — Newcomen engine. Steam from the boiler.

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