Lighthouse and newcomen engine: what they have in common

1. Step 1. Lighthouse — has part — Rotation mechanism. It rotates the optics, setting the flash pattern.
2. Step 2. Rotation mechanism — is part of — Rock drill. It rotates the rod between blows.
3. Step 3. Rock drill — has part — Piston. A percussion piston.
4. Step 4. Piston — is part of — Newcomen engine. Atmospheric pressure moves the piston.

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