Steam hammer and electric motor: what they have in common

1. Step 1. Steam hammer — evolved from — Trip hammer. The mechanization of forging.
2. Step 2. Trip hammer — has part — Water wheel. The shaft was turned by a water wheel.
3. Step 3. Water wheel — is used in — Rolling mill. The first mills were turned by water.
4. Step 4. Rolling mill — has part — Electric motor. The drive.

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