File:Bulletin de la Soci des sciences naturelles de Neuchl (1844-1897.) (20440775911).jpg

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Title: Bulletin de la Soci des sciences naturelles de Neuchl
Identifier: bulletindelasoci1864soci (find matches)
Year: 1844-1897. (1840s)
Authors: Soci des sciences naturelles de Neuchl
Subjects: Natural history; Science
Publisher: Neuchl : Soci des sciences naturelles de Neuchl
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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â 86 â station orientale que sur celui de l'autre, comme on peut se convaincre facilement par la figure suivante, dans laquelle des points diamétralement opposéa correspondent au même mo- ment.
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On voit immédiatement que la différence des deux chrono- graphes est le double du temps de transmission. Et remarquez que les quantités 2 T, que Ton trouve ainsi par la comparaison des deux chronographes, sont tout-à -fait indépendantes de Texactitude des observations astronomiques, de Téquation per- sonnelle, etc. En effet on les obtiendrait de même, en donnant des signaux tout-à -fait arbitraires et à des intervalles quelcon- ques aux deux stations en question. Ainsi Texactitude avec laquelle on détermine ce temps de transmission dépend uni- quement de celle des instruments enregistreurs employés; c'est-à -dire essentiellement de deu^ éléments, d'abord de la régularité avec laquelle les pendules sont enregistrées sur les chronographes et ensuite de Texactitude avec laquelle on peut faire le relevé des signaux marqués sur le papier des chro- nographes. Pour obtenir des résultats nets sur le temps de la transmis- sion , il fallait déterminer les limites de Tinfluence de ces er- reurs, et la méthode d'observation que nous avons employée permettait de le faire assez exactement. Vous savez qu'on observe le passage des étoiles non pas au méridien même qui est une ligne fictive, mais à un certain nombre de fils; donc j'envoyai à chaque passage d'étoile 21 courants à Grenève qui s'y marquaient aussi bien que chez moi; Genève, dont la lunette ne possède que 5 fils, nous envoyait

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https://www.flickr.com/photos/internetarchivebookimages/20440775911/

Author Internet Archive Book Images
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(Reusing this file)		 At the time of upload, the image license was automatically confirmed using the Flickr API. For more information see Flickr API detail.
Volume
InfoField
1861
Flickr tags
InfoField
  • bookid:bulletindelasoci1864soci
  • bookyear:1844-1897.
  • bookdecade:1840
  • bookcentury:1800
  • bookauthor:Soci_des_sciences_naturelles_de_Neuchl
  • booksubject:Natural_history
  • booksubject:Science
  • bookpublisher:Neuchl_Soci_des_sciences_naturelles_de_Neuchl
  • bookcontributor:American_Museum_of_Natural_History_Library
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:94
  • bookcollection:biodiversity
  • bookcollection:americanmuseumnaturalhistory
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
9 August 2015



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