پرونده:DanielColladon's Lightfountain or Lightpipe,LaNature(magazine),1884.JPG

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پروندهٔ اصلی(۴۵۸ × ۷۳۷ پیکسل، اندازهٔ پرونده: ۷۷ کیلوبایت، نوع MIME پرونده: image/jpeg)

Author: Jean-Daniel Colladon (1802-1893). Source: This illustration appears in "La Nature" magazine in 1884 and it is reproduced in modern-day accounts of the history of fiber optics including Jeff Hecht's book Story of Fiber Optics and i-fiberoptics.com archive copy at the Wayback Machine. Collodon first described the system in an article in "Comptes Rendus" 1842, and described it again in 1884 in "La Nature". In the above illustration, water comes out of a short spout on the watertank and then falls through open air, as in a fountain. The device on the illustration's lefthand side produces light and directs a beam of light into the watertank. The demonstration of this "light fountain" needs to be done in a darkened room to see the effect.

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You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).

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2009-02-08 22:10:52 Seanwal111111 78802 458×737 Author: Jean-Daniel Colladon (1802-1893). Source: This illustration appears in ''"La Nature"'' magazine in 1884 and it is reproduced in modern-day accounts of the history of fiber optics including [http://books.google.fm/books?id=_G8B_lU_UHEC&pg=PA13&lpg

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کنونی‏۷ اکتبر ۲۰۰۹، ساعت ۱۴:۰۹تصویر بندانگشتی از نسخهٔ مورخ ‏۷ اکتبر ۲۰۰۹، ساعت ۱۴:۰۹۴۵۸ در ۷۳۷ (۷۷ کیلوبایت)CommonsHelper2 Bot {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} Author: Jean-Daniel Colladon (1802-1893). Source: This illustration appears in ''"La Nature"'' magazine in 1884 and it is re

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