Blacksmith’s tongs and watt steam engine: what they have in common

1. Step 1. Blacksmith’s tongs — is used in — Forge. The smith holds the workpiece with tongs.
2. Step 2. Forge — is used in — Forging press. The workpiece is heated in a forge before pressing.
3. Step 3. Forging press — evolved from — Steam hammer. Pressing instead of striking.
4. Step 4. Steam hammer — has part — Cylinder. A steam cylinder.
5. Step 5. Cylinder — is part of — Watt steam engine. Steam works in the cylinder.

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