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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mastodon.social/users/gutenberg_org/statuses/113159303216620413">Project Gutenberg (gutenberg_org@mastodon.social)'s status on Thursday, 19-Sep-2024 11:54:33 JST</a><a href="https://mastodon.social/@gutenberg_org" title="gutenberg_org@mastodon.social"><img src="https://gnusocial.jp/avatar/132842-48-20230813103534.webp" width="48" height="48" alt="Project Gutenberg" style="position: absolute; left: 0; top: 0;">Project Gutenberg</a></section><article><p>French physicist Léon Foucault was born <a href="https://mastodon.social/tags/OTD" rel="tag">#OTD</a> in 1819.</p><p>He is best known for his demonstration of the Foucault pendulum, a device demonstrating the effect of Earth's rotation. With Hippolyte Fizeau he carried out a series of investigations on the intensity of the light of the sun, as compared with that of carbon in the arc lamp, and of lime in the flame of the oxyhydrogen blowpipe. His is one of the 72 names inscribed on the Eiffel Tower.</p><p><a href="https://en.wikipedia.org/wiki/L%C3%A9on_Foucault" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/L%C3%A9on_Foucault</a></p><p><a href="https://mastodon.social/tags/physics" rel="tag">#physics</a> <a href="https://mastodon.social/tags/optics" rel="tag">#optics</a> <a href="https://mastodon.social/tags/mechanics" rel="tag">#mechanics</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/3692294#notice-7232924">In conversation</a><time datetime="2024-09-19T11:54:33+09:00" title="Thursday, 19-Sep-2024 11:54:33 JST">about 2 months ago</time> <span>from <span><a href="https://mastodon.social/@gutenberg_org/113159303216620413" rel="external" title="Sent from mastodon.social via ActivityPub">mastodon.social</a></span></span><a href="https://mastodon.social/@gutenberg_org/113159303216620413">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/3190644">Portrait of Léon Foucault french physicist, astronomer(1819–1868).
Photograph by Bertall &amp; Cie.Foucault’s face is often characterized by a calm, serious expression, fitting for a scientist of his stature. His features, which include a high forehead and prominent nose, reflect the intellectual rigor and curiosity that drove his scientific work. Foucault is depicted wearing formal attire, typically a dark coat and a high-collared shirt, as was customary for gentlemen and scholars in the 19th century. Foucault is often portrayed with neatly styled hair, parted at the side, and a well-groomed beard or mustache. Foucault is seated or standing in a formal pose with a book in his left hand.</a></label><br><a href="https://files.mastodon.social/media_attachments/files/113/159/249/012/299/212/original/c63e3f74c6e625bc.jpg" rel="external">https://files.mastodon.social/media_attachments/files/113/159/249/012/299/212/original/c63e3f74c6e625bc.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3190645">Foucault Pendulum. Pendulum for Showing the Rotation of the Earth.A print of the Foucault Pendulum, 1895T. O'Conor Sloane - Facts Worth Knowing Selected Mainly from the Scientific American for Household, Workshop, and Farm Embracing Practical and Useful Information for Every Branch of Industry.</a></label><br><a href="https://files.mastodon.social/media_attachments/files/113/159/277/023/699/820/original/5edc24a000b9a528.jpg" rel="external">https://files.mastodon.social/media_attachments/files/113/159/277/023/699/820/original/5edc24a000b9a528.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3190646">The first photograph of the Sun was made by Léon Foucault and Hippolyte Fizeau on 2 April 1845 in Paris, France.
Hippolyte Fizeau, Léon Foucault - http://time.com/3807904/first-photograph-of-the-sun/</a></label><br><a href="https://files.mastodon.social/media_attachments/files/113/159/288/163/159/118/original/b90712632bd90436.jpg" rel="external">https://files.mastodon.social/media_attachments/files/113/159/288/163/159/118/original/b90712632bd90436.jpg</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/3190647">Foucault's determination of the relative speed of light in air vs water. Light from a passing through a slit (not shown) is reflected by mirror m (rotating clockwise around c) towards the concave spherical mirrors M and M'. Lens L forms images of the slit on the surfaces of the two concave mirrors. The light path from m to M is entirely through air, while the light path from m to M' is mostly through a water-filled tube T. Lens L' compensates for the effects of the water on the focus. The light reflected back from mirrors M and M' is diverted by a beam splitter towards an eyepiece O. If mirror m is stationary, both images of the slit reflected by M and M' reform at position α. If mirror m is rapidly rotating, light reflected from M forms an image of the slit at α' while light reflected from M' forms an image of the slit at α". The experiment demonstrated that light travels more slowly through water than air. Thus, it disproved Newton's hypothesis that Snell's Law results from an increase in the speed of ballistic light particles as they crossed an air/water interface, and gave what was considered to be definitive support of the wave theory of light.Léon Foucault (18 September 1819 – 11 February 1868) - This is Figure 3 from Sur les vitesses relatives de la lumière dans l'air et dans l'eau / par Léon Foucault (1853).</a></label><br><a href="https://files.mastodon.social/media_attachments/files/113/159/288/947/425/053/original/84df0af92984fea3.png" rel="external">https://files.mastodon.social/media_attachments/files/113/159/288/947/425/053/original/84df0af92984fea3.png</a></li></ol></footer></blockquote>

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Project Gutenberg (gutenberg_org@mastodon.social)'s status on Thursday, 19-Sep-2024 11:54:33 JST Project Gutenberg
French physicist Léon Foucault was born #OTD in 1819.
He is best known for his demonstration of the Foucault pendulum, a device demonstrating the effect of Earth's rotation. With Hippolyte Fizeau he carried out a series of investigations on the intensity of the light of the sun, as compared with that of carbon in the arc lamp, and of lime in the flame of the oxyhydrogen blowpipe. His is one of the 72 names inscribed on the Eiffel Tower.
https://en.wikipedia.org/wiki/L%C3%A9on_Foucault
#physics #optics #mechanics
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