De quoi est fait lighthouse
A tower with a fire for navigation; the Lighthouse of Alexandria.
- Lighthouse tower — a pour partie. A tall base for the light source.
- Fresnel lens — a pour partie. A stepped lens gathers the light into a beam.
- Lighthouse lamp — a pour partie. The lamp: oil, kerosene, then electricity.
- Rotation mechanism — a pour partie. It rotates the optics, setting the flash pattern.
- Combustion — utilise. Ancient lighthouses shone with fire.
- Stone — est fait de. The Lighthouse of Alexandria was a stone tower.