Polished limestone casing and rock drill: what they have in common

1. Step 1. Polished limestone casing — is part of — Egyptian pyramid. Polished limestone of the outer faces.
2. Step 2. Egyptian pyramid — is made of — Stone. The pyramids are built of limestone and granite blocks.
3. Step 3. Stone — is material for — Lighthouse. The Lighthouse of Alexandria was a stone tower.
4. Step 4. Lighthouse — has part — Rotation mechanism. It rotates the optics, setting the flash pattern.
5. Step 5. Rotation mechanism — is part of — Rock drill. It rotates the rod between blows.

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