Handle wedge e shaduf: o que têm em comum

1. Passo 1. Handle wedge — faz parte de — Hammer. It wedges the handle in the eye.
2. Passo 2. Hammer — evoluiu para — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
3. Passo 3. Trip hammer — tem como parte — Water wheel. The shaft was turned by a water wheel.
4. Passo 4. Water wheel — é utilizado em — Noria. The current itself turns the wheel.
5. Passo 5. Noria — é utilizado em — Irrigation. Norias lifted water into canals.
6. Passo 6. Irrigation — utiliza — Shaduf. The shaduf fed water into the canals.

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