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Elements de Physique Experimentale & de Meteorologie (2)

Elements de Physique Experimentale & de Meteorologie (2)


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About the Book

Ce livre historique peut avoir de nombreuses fautes de frappe, le texte manquant, des images ou des index. Les acheteurs peuvent telecharger une copie gratuite scannee du livre original (sans fautes de frappe) de l'editeur. Non illustre. 1844. Extrait: ... Alors, pendant une revolution du plateau, le trou de la table sera 1o fois ouvert et 1o fois ferme, et par consequent l'ecoulement de l'air qui arrive par le porte-vent aura lieu 1o fois et sera 1o fois arrete. Cet effet se produira dans i" ou dans un I"/io ou dans i"/ioo, suivant que le plateau fera i tour, 1o tours ou 1oo tours par seconde; et, comme l'airquiest vivement pousse et brusquement arrete produit a chaque alternative une vibration, il en resulte que l'on anra de la sorte 2o vibrations pour chaque tour du plateau, et par consequent 2o, 20o ou 2, ooo vibrations par seconde. Ainsi la sirene doit rendre des sons qui montent par degre, ou plutot par nuances insensibles, depuis le plus grave jusqu'au plus aigu. Et c'est en effet ce que l'experience confirme. Maintenant, si, au lieu de supposer, comme nous l'avons fait, un seul trou dans la table, on suppose qu'il y en ait 1o comme dans le plateau, on aura seulement un son 1o fois plus intense, car chaque trou produira son effet comme s'il etait seul. Le nombre, la forme et la grandeur des trous paraissent avoir sur le timbre du son une influence dont jusqu'a present on ne s'est rendu compte que par des considerations trop peu rigoureuses pour qu'il nous soit permis de les developper; il en est de meme des divers effets que l'on obtient en laissant entre les trous des intervalles pleins plus ou moins grands: seulement, M. Cagniard de la Tour pense que, si les intervalles pleins sont tres-petits, le son se rapproche de la voix humaine, et que, s'ils sont tres-grands, le son se rapproche de celui de la trompette. Enfin, l'epaisseur de...


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Product Details
  • ISBN-13: 9781235574238
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 218
  • Spine Width: 12 mm
  • Width: 189 mm
  • ISBN-10: 1235574237
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 399 gr


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