Spear e mechanical clock: o que têm em comum

1. Passo 1. Spear — evoluiu para — Harpoon. A spear with barbs.
2. Passo 2. Harpoon — tem como parte — Rope. A line connects the head to the hunter.
3. Passo 3. Rope — faz parte de — Chip log. On a line with knots.
4. Passo 4. Chip log — utiliza — Hourglass. The time of a speed measurement was taken with an hourglass.
5. Passo 5. Hourglass — funciona como — Water clock (clepsydra). The same principle of timing by outflow, with sand instead of water.
6. Passo 6. Water clock (clepsydra) — evoluiu para — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.

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