Image:Fresnel lighthouse lens diagram.png
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[edit] Summary
| Description |
Section diagram showing how a Fresnel lens in a lighthouse works to concentrate light from an oil lamp into a beam. The Fresnel lens, invented in 1822 by Augustin-Jean Fresnel, increased the light projecting power of lighthouses greatly without the weight of a conventional lens of it's size. Also shown are mirror strips mounted above and below the lens that most lighthouses had, to gather more of the lamp's light. Alterations: removed caption, erased blots in white areas, changed brightness levels to get rid of noise in white areas, sharpened light path lines. |
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| Source |
Downloaded from Adolphe Ganot (1872) Natural Philosophy for General Readers and Young Persons, D. Appleton & Co., New York, p.328, fig.257 (translated with permission from Ganot's Cours Élémentaire de Physique by Edmund Atkinson) |
| Date |
1872 |
| Author |
Adolphe Ganot |
| Permission (Reusing this image) |
Public domain - published in USA before 1923 |
[edit] Licensing
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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, 1923. See this page for further explanation.
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| Date/Time | Dimensions | User | Comment | |
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| current | 10:03, 17 December 2007 | 492×578 (88 KB) | Chetvorno | ({{Information |Description=Diagram of how a Fresnel lens in a lighthouse works. |Source=Downloaded from [http://books.google.com/books?id=sKELAAAAYAAJ&pg=PA328 Adolphe Ganot (1872) ''Natural Philosophy for General Readers and Young Persons'', D. Appleton ) |
