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Home > Art, Film & Photography > Du Vol Des Oiseaux; Indication Des Sept Lois Du Vol Rame Et Des Huit Lois Du Vol a Voile
Du Vol Des Oiseaux; Indication Des Sept Lois Du Vol Rame Et Des Huit Lois Du Vol a Voile

Du Vol Des Oiseaux; Indication Des Sept Lois Du Vol Rame Et Des Huit Lois Du Vol a Voile


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About the Book

Ce livre historique peut contenir de nombreuses coquilles et du texte manquant. Les acheteurs peuvent generalement telecharger une copie gratuite scannee du livre original (sans les coquilles) aupres de l'editeur. Non reference. Non illustre. 1865 edition. Extrait: ...savants qui ont fait loi jadis dans l'histoire de la direction aeriennne. M. Navier estimait que l'aigle, dans un vol horizontal de I5 metres a la seconde, faisait un effort suffisant pour elever son propre poids a 390 metres de hauteur verticale, ce qui represente une force de 26 chevaux. On voit que son erreur etait de 38900 pour 100 ou de 389 pour 1. Une elevation de 1 metre par seconde ne depasse pas celle qu'obtient un homme montant rapidement un escalier. Cela ne veut pas dire que l'homme puisse jamais soutenir, par ses propres forces, un vol rame de quelque duree, ou meme un vol rame quelconque non descendant, parce qu'a son propre poids il faudra ajouter celui d'un appareil; mais cela veut dire que l'oiseau n'est point un etre phenomenal et doue de forces qui renversent l'imagination, aussi bien que lu bon sens; c'est seulement un etre cree pour une destination speciale et unique, qu'il doit remplir beaucoup mieux que ne ferait tout autre etre cree en vue d'un genre de locomotion different. Les insectes possedent tous une prodigieuse rapidite de coup d'aile, en raison de la brievete et de la legerete de leur appareil. Les moucherons doivent battre plusieurs centaines de coups a la seconde; les hannetons, frelons et autres gros insectes doivent, en tous cas, battre beaucoup plus de 25 coups. J'en dirai autant des colibris et des oiseaux mouches, dont le coup d'aile echappe a la vue. Les petits oiseaux d'Europe se rapprochent plus ou moins des colibris pour la rapidite des...


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Product Details
  • ISBN-13: 9781153567602
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1153567601
  • Publisher Date: 01 Jan 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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