Eixo de cames e sickle: o que têm em comum

1. Passo 1. Eixo de cames — tem como parte — Came. The shaft carries several cams.
2. Passo 2. Came — faz parte de — Trip hammer. Cams on the shaft lift the hammer.
3. Passo 3. Trip hammer — evoluiu de — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
4. Passo 4. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.
5. Passo 5. Stone tool — evoluiu para — Sickle. The first sickles had flint inserts.

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