దస్త్రం:Lighthouse lantern room with Fresnel lens.png

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అసలు దస్త్రం ‎(642 × 892 పిక్సెళ్ళు, ఫైలు పరిమాణం: 150 KB, MIME రకం: image/png)

వివరణ
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.
తేదీ
మూలం 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
కర్త Adolphe Ganot
అనుమతి
(ఈ దస్త్రాన్ని పునర్వినియోగించుకోవడం)		 Public domain - Published in USA before 1923.


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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
United States
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ప్రస్తుత12:58, 17 డిసెంబరు 200712:58, 17 డిసెంబరు 2007 నాటి కూర్పు నఖచిత్రం642 × 892 (150 KB)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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