Berkas:Fresnel lighthouse lens diagram.png

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Fresnel_lighthouse_lens_diagram.png ‎(492 × 578 piksel, ukuran berkas: 88 KB, tipe MIME: image/png)

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Ringkasan

Deskripsi
English: Section diagram showing how a Fresnel lens (A) in a lighthouse works to collimate light from an oil lamp (L) into a parallel 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 its size. Also shown are mirror strips (m,n) 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.
Tanggal
Sumber 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)
Pembuat Adolphe Ganot
Izin
(Menggunakan kembali berkas ini)		 Public domain - Ganot died in 1887; published in USA before 1923

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Public domain
Public domain
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
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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Riwayat berkas

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Tanggal/WaktuMiniaturDimensiPenggunaKomentar
terkini17 Desember 2007 10.03Miniatur versi sejak 17 Desember 2007 10.03492 × 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

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