File:Lighthouse lantern room with Fresnel lens.png

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current12:58, 17 December 2007Thumbnail for version as of 12:58, 17 December 2007642 × 892 (150 KB)commons>Chetvorno{{Information |Description=Cutaway drawing of a lighthouse lantern room. Source says this was a lens of the 'largest size' made by M. Souter and exhibited at the Paris International Exposition in 1855. |Source=Downloaded from [http://books.google.com/boo

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