File:Exemple d'une machinerie destinée à effectuer des sondages.jpg

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Français : Image extraite de l'ouvrage Traité sur les puits artésiens ou sur les différentes espèces de terrains dans lesquels on doit rechercher des eaux souterraines afin d'illustrer les techniques utilisées au XIXème siècle afin d'exécuter des forages, que ce soit pour rechercher de l'eau, ou de la houille. L'image représente une vue de profil puis une vue de face d'une « machinerie » destinée à exécuter des forages. Utilisée dans le Nord-Pas-de-Calais pour effectuer des puits artésiens, ce type de machine peut très bien forer le sol afin de rechercher le charbon. En ce sens, cette « machinerie » utilisée dans les années 1820 peut très bien être en vigueur entre 1837 et 1844 pour effectuer des sondages de recherche de charbon. La Compagnie d'Hasnon a effectué neuf sondages dans les communes d'Hasnon et Wallers. Bien qu'ils n'aient pas pu permettre la découverte de veines exploitables de charbon, ce sondages ont pu définir une limite septentrionale du bassin minier du Nord-Pas-de-Calais.
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Français : F. Garnier, Traité sur les puits artésiens ou sur les différentes espèces de terrains dans lesquels on doit rechercher des eaux souterraines, 1826 (seconde édition)
Author F. Garnier
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This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
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current10:56, 16 January 2011Thumbnail for version as of 10:56, 16 January 20112,342 × 2,017 (636 KB)Jérémy-Günther-Heinz Jähnick (talk | contribs){{Information |Description={{fr|1=Image extraite de l'ouvrage ''Traité sur les puits artésiens ou sur les différentes espèces de terrains dans lesquels on doit rechercher des eaux souterraines'' afin d'illustrer les techniques utilisées au XIXème si

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