Lighthouse tower and chisel: what they have in common

1. Step 1. Lighthouse tower — is part of — Lighthouse. A tall base for the light source.
2. Step 2. Lighthouse — has part — Rotation mechanism. It rotates the optics, setting the flash pattern.
3. Step 3. Rotation mechanism — is part of — Rock drill. It rotates the rod between blows.
4. Step 4. Rock drill — is used in — Tunnel. Driving the Mont Cenis tunnel.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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