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C'EST EST pour la commodité des Navigateurs que j'ai cru devoir donner les Tables précédentes de deux manières; la première, en comptant les degrés de Déclinaifon & d'Inclinaifon, depuis le plus petit jufqu'au plus grand; & la feconde, en comptant ces mêmes variations depuis zéro de Latitude jufqu'aux plus hauts degrés de Latitude boréale & auftrale où l'on ait fait des obfervations. Les Tables conftruites d'après la première manière, indiqueront aux Marins le lieu où ils feront, lorsque leurs Bouffoles marqueront tel ou tel degré de déclinaifon ou d'inclinaifon, tandis que les Tables rédigées de la feconde manière, leur feront connoître les Obfervations précédemment faites dans les lieux où ils fe trouveront, & les mettront à portée de les confirmer ou de les corriger; &, pour une plus grande facilité, j'ai encore penfé qu'il étoit néceffaire de faire des Cartes magnétiques d'après ces mêmes Tables d'Obfervations, & de placer dans ces Cartes les obfervations les plus avérées des Voyageurs les plus récents, c'est-à-dire, depuis l'année 1775 : & lorfque, pour le même lieu, il s'eft trouvé plusieurs observations faites depuis 1775, nous avons préféré de marquer fur les Cartes, l'obfervation de la déclinaifon ou de l'inclinaifon la plus forte, & nous avons négligé les autres, que cependant on trouvera dans les Tables

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