Planimeter and hydraulic press: what they have in common

1. Step 1. Planimeter — has part — Wheel. A measuring wheel computes the area.
2. Step 2. Wheel — includes — Water wheel. A water wheel is a wheel with paddles turned by flowing water.
3. Step 3. Water wheel — is part of — Trip hammer. The shaft was turned by a water wheel.
4. Step 4. Trip hammer — evolved into — Steam hammer. The mechanization of forging.
5. Step 5. Steam hammer — evolved into — Forging press. Pressing instead of striking.
6. Step 6. Forging press — is a kind of — Hydraulic press. A press.

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