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Télégraphie électrique, ses développements
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ISBN10: 1546628681
ISBN13: 9781546628682
Publisher: Createspace
Published: May 11 2017
Pages: 36
Weight: 0.10
Height: 0.07 Width: 5.00 Depth: 8.00
Language: French
ISBN13: 9781546628682
Publisher: Createspace
Published: May 11 2017
Pages: 36
Weight: 0.10
Height: 0.07 Width: 5.00 Depth: 8.00
Language: French
La télégraphie électrique a pour but d'envoyer, au moyen des courants électriques, des signaux à de grandes distances. La France semble devoir être le pays le plus favorable aux communications télégraphiques. Les télégraphes aériens de Chappe ont fait jusqu'à nos jours honneur à la France, ainsi que le reconnaît un auteur anglais, et l'usage de ces appareils n'est point encore abandonné; ils ne redoutent que les temps de brouillard, qui interceptent la vision des flèches mobiles qu'ils emploient. Quoique la rapidité de transmission des dépêches par cette voie parût, vers la fin du siècle dernier, tout à fait admirable, elle n'est rien, comparée à la vitesse de l'électricité sur les fils conducteurs, car on sait par des expériences précises, et dont l'initiative est due à M. Wheatstone, que le courant électrique, en une seconde de temps, ferait plusieurs fois le tour de la terre. Et d'abord qu'est-ce que c'est que l'électricité? Il y a en général trois manières de définir: par étymologie, par énumération, par théorie...
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