File:Bulletin des sciences (1814) (20252722579).jpg

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Title: Bulletin des sciences
Identifier: bulletindesscien79plas (find matches)
Year: 1814 (1810s)
Authors: Plassan, Joseph-Raymond, printer; Société philomathique de Paris
Subjects: Société philomathique de Paris; Science
Publisher: Paris : Plassan
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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( 1^4 ) branlement et se mesure la vitesse de propagation ; la difiérence entre BC et FF sera celle des chemins parcourus par les pomis E et B, quelles-que soient d'ailleurs les petites inflexions que l'onde et les rayons peuvent éprouver dans le voisinage de AC, puisqu'elles seront les mêmes pour toutes les parties de l'onde qui atteindront successivement A C, à cause de la similitude parfaite des circonstances; si donc, on multiplie BCâEF par la vitesse de propagation de la lumière dans le premier mi- lieu , on aura le temps qui s'écoule entre l'arrivée des pomts E et B a la surface réfringente A C.
Text Appearing After Image:
D'après le principe de la coexistence des petits mouvements, nous fiouvons considérer chaque point ébranlé de celte surface comme étant ui-même un centre d'ébranlement par rapport au second milieu, dans lequel il produirait, s'il agissait seul, une onde sphérique décrite de ce même point comme centre. Cette onde aurait-elle la même intensité dans toute l'étendue de sa surface, c'est-à -dire, les oscillations des molécules éthérées y auraient-elles partout la même amplitude, la même vitesse ab- solue? Non sans doute, et cette vitesse pourrait même être nulle dans une partie de la surface de l'onde. Mais, i* comme les vitesses absolues des molécules n'ont aucune influence sur la vitesse de propagation, elle se- ra la même en tout sens, et l'onde dérivée sera sphérique. 2°. Les vitesses absolues des molécules ne changeront brusquement ni d'intensité, ni de

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Volume
InfoField
v. 7-9
Flickr tags
InfoField
  • bookid:bulletindesscien79plas
  • bookyear:1814
  • bookdecade:1810
  • bookcentury:1800
  • bookauthor:Plassan_Joseph_Raymond_printer
  • bookauthor:Soci_t_philomathique_de_Paris
  • booksubject:Soci_t_philomathique_de_Paris
  • booksubject:Science
  • bookpublisher:Paris_Plassan
  • bookcontributor:Smithsonian_Libraries
  • booksponsor:Smithsonian_Libraries
  • bookleafnumber:364
  • bookcollection:biodiversity
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
9 August 2015



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current12:23, 21 September 2015Thumbnail for version as of 12:23, 21 September 20151,354 × 942 (392 KB) (talk | contribs)== {{int:filedesc}} == {{information |description={{en|1=<br> '''Title''': Bulletin des sciences<br> '''Identifier''': bulletindesscien79plas ([https://commons.wikimedia.org/w/index.php?title=Special%3ASearch&profile=default&fulltext=Search&search=inso...

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