Marine chronometer e sickle: o que têm em comum

1. Passo 1. Marine chronometer — evoluiu de — Pocket watch. Harrison moved from large clocks to the pocket-sized H4.
2. Passo 2. Pocket watch — tem como parte — Gear. The wheel train carries energy to the hands.
3. Passo 3. Gear — faz parte de — Lawn mower. The wheels turn the blade cylinder through gears.
4. Passo 4. Lawn mower — evoluiu de — Sickle. Mechanized mowing.

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