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İzahLighthouse lantern room with Fresnel lens.png
English: Cutaway drawing of a lighthouse lantern room from mid 1800s showing the Fresnel lens. Source says this was a lens of the 'largest size', made by M. Souter and exhibited at the Paris Universal Exposition in 1855. The cylindrical lens with 8 faces stood 10 feet high. A clockwork mechanism (M), driven by weight (P), slowly turns the entire lamp-lens assembly (A,B) on six rollers. This system, invented by Augustin-Jean Fresnel, scans the 8 beams from the lens around the whole horizon. The resulting regularly flashing light seen by mariners served to distinguish the lighthouse from stars or shore lights. Alterations: removed caption.
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Downloaded from Adolphe Ganot (1872) Natural Philosophy for General Readers and Young Persons (translated with permission from Ganot's Cours Élémentaire de Physique by Edmund Atkinson), D. Appleton & Co., New York, p.329, fig.258 on Google Books
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Adolphe Ganot
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Public domain - Published in USA before 1923.
Public domainPublic domainfalsefalse
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{{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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