Size of this preview: 431 × 599 pixels. Other resolutions: 173 × 240 pixels | 345 × 480 pixels | 642 × 892 pixels.
Original file (642 × 892 pixels, file size: 150 KB, MIME type: image/png)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
| Description |
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. |
| Date | |
| Source | 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 |
| Author | Adolphe Ganot |
| Permission (Reusing this file) |
Public domain - Published in USA before 1923. |
 |
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.
|
 |
 |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:58, 17 December 2007 | | 642 × 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 |
File usage
The following 3 pages use this file:
Global file usage
The following other wikis use this file:
- Usage on az.wikipedia.org
- Usage on ca.wikipedia.org
- Usage on cs.wikipedia.org
- Usage on da.wikipedia.org
- Usage on es.wikipedia.org
- Usage on fr.wikipedia.org
- Usage on it.wikipedia.org
- Usage on ja.wikipedia.org
- Usage on kn.wikipedia.org
- Usage on or.wikipedia.org
- Usage on pl.wikipedia.org
- Usage on sk.wikipedia.org
- Usage on sl.wikipedia.org
- Usage on sq.wikipedia.org
