Category:Biform Fresnel lenses

Subcategories

This category has only the following subcategory.

Media in category "Biform Fresnel lenses"

The following 4 files are in this category, out of 4 total.

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  EB1911 - Lighthouse - Fig. 54.—Fastnet Lighthouse—First order single-flashing biform apparatus.jpg 425 × 1,070; 254 KB
  
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  Lighthouse Lantern - geograph.org.uk - 590553.jpg 480 × 640; 105 KB
  
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  Souter lighthouse, main optic.jpg 5,376 × 3,024; 4.66 MB
  
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  Souter Lighthouse, optic and pedestal.jpg 3,024 × 5,376; 4.47 MB