Wooden bellows boards and hammer: what they have in common

1. Step 1. Wooden bellows boards — is part of — Bellows. Rigid walls.
2. Step 2. Bellows — is part of — Forge. Bellows fan the fire of the forge.
3. Step 3. Forge — is used in — Forging press. The workpiece is heated in a forge before pressing.
4. Step 4. Forging press — evolved from — Steam hammer. Pressing instead of striking.
5. Step 5. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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