ଫାଇଲ:Lighthouse lantern room with Fresnel lens.png
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ସିଧା ଖୋଜନ୍ତୁ
ଏହି ଦେଖଣାର ଆକାର: ୪୩୧ × ୫୯୯ ପିକ୍ସେଲ । ବାକି ରେଜୋଲୁସନ: ୧୭୩ × ୨୪୦ ପିକ୍ସେଲ | ୩୪୫ × ୪୮୦ ପିକ୍ସେଲ | ୬୪୨ × ୮୯୨ ପିକ୍ସେଲ.
ମୂଳ ଫାଇଲ (୬୪୨ × ୮୯୨ ପିକସେଲ, ଫାଇଲ ଆକାର: ୧୫୦ KB, ଏମ.ଆଇ.ଏମ.ଇର ପ୍ରକାର: image/png)
ସାରକଥା
| ବିବରଣୀ |
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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| ମୂଳାଧାର | 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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ସତ୍ଵ
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The author died in 1887, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1931. |
| ଏହି ଫାଇଲଟିକୁ ସବୁ ସମ୍ଭନ୍ଧିତ ଓ ପାଖାପାଖି ନୀତି ଅନୁସାଅରେ ସତ୍ଵାଧିକାର ନୀତି ଅନୁସାରେ ସମସ୍ତ କଟକଣାରୁ କୋହଳ କରାଯାଇଛି । | |
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ଏହା ଫାଇଲଟି ସେତେବେଳେ ଯେମିତି ଦିଶୁଥିଲା ତାହା ଦେଖିବା ପାଇଁ ତାରିଖ/ବେଳା ଉପରେ କ୍ଲିକ କରନ୍ତୁ
| ତାରିଖ/ବେଳ | ନଖ ଦେଖଣା | ଆକାର | ବ୍ୟବହାରକାରୀ | ମତାମତ | |
|---|---|---|---|---|---|
| ଏବେକାର | ୧୩:୫୮, ୧୭ ଡିସେମ୍ବର ୨୦୦୭ | | ୬୪୨ × ୮୯୨ (୧୫୦ KB) | wikimediacommons>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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