Bifacially knapped stone surface e electrical telegraph: o que têm em comum

1. Passo 1. Bifacially knapped stone surface — faz parte de — Hand axe. Flaking on both sides gives a symmetrical edge.
2. Passo 2. Hand axe — evoluiu para — Machado. A hand axe mounted on a handle.
3. Passo 3. Machado — utiliza — Lever. The haft lengthens the arm of the blow.
4. Passo 4. Lever — é utilizado em — Optical telegraph. The arms were moved by a system of levers and rods.
5. Passo 5. Optical telegraph — evoluiu para — Electrical telegraph. The electrical telegraph replaced semaphore lines.

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