Centrifugal governor and stone tool: what they have in common

1. Step 1. Centrifugal governor — is part of — Watt steam engine. Watt used a centrifugal governor to keep the speed steady.
2. Step 2. Watt steam engine — has part — Cylinder. Steam works in the cylinder.
3. Step 3. Cylinder — is part of — Steam hammer. A steam cylinder.
4. Step 4. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Step 5. Hammer — evolved from — Stone tool. The first hammer was a stone in the hand.

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