Program control of a machine e sickle: o que têm em comum

1. Passo 1. Program control of a machine — é utilizado em — Autômato. The sequence of movements is “recorded” in cams and cylinders.
2. Passo 2. Autômato — tem como parte — Came. Cams set the figures’ movements.
3. Passo 3. Came — faz parte de — Trip hammer. Cams on the shaft lift the hammer.
4. Passo 4. Trip hammer — evoluiu de — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
5. Passo 5. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.
6. Passo 6. Stone tool — evoluiu para — Sickle. The first sickles had flint inserts.

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