Handle wedge and shaduf: what they have in common

1. Step 1. Handle wedge — is part of — Hammer. It wedges the handle in the eye.
2. Step 2. Hammer — evolved into — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
3. Step 3. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
4. Step 4. Water wheel — is used in — Noria. The current itself turns the wheel.
5. Step 5. Noria — is used in — Irrigation. Norias lifted water into canals.
6. Step 6. Irrigation — uses — Shaduf. The shaduf fed water into the canals.

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