Turbine and stone tool: what they have in common

1. Step 1. Turbine — evolved from — Water wheel. The water turbine evolved from the water wheel.
2. Step 2. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
3. Step 3. Trip hammer — evolved from — Hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
4. Step 4. Hammer — evolved from — Stone tool. The first hammer was a stone in the hand.

Open Evothings