DEGAULLE, Jean-Baptiste. New Reduced Map of the Channel of B - Lot 165

DEGAULLE, Jean-Baptiste. New Reduced Map of the Channel of Brittany In Three Leaves. Le Hâvre, 1778. Boundaries in old col. Map in 20 segments, spotting, paper heavily browned. As is. 945 x 1805 mm. Title: "Nouvelle carte réduite de la Manche de Bretagne en trois feuilles, publiée sous the approval of the Royal Academies of Sciences and Marine, dedicated to the trade". J. Dezauche sculpt. First edition in 1773. Cartouche at lower right: "Map of the English Channel For France from Dunquerk to Ushant; For England from Colchester north of the Thames to Cape Clare in Ireland; Numerous coastal profiles and enlarged portions (cartoons) of the Sorlingues and Plimouth harbour". Longitude of the Tenerife meridian; western longitude of the Paris meridian; western longitude of the of the London meridian; first meridian of Lizard. Marine leagues of France and England from 20 to the degree. A cartouche on the right side concerns the observations on the new new Normandy lighthouses >> Among the remarks noted are: "Ordinary figures mark the number of fathoms. "Roman numerals indicate the time of high water on new and full moon days. " "The arrows mark the direction of the currents as the sea rises." "The numbers (finance numbers) placed on the punctuated lines that follow the land slide of the land mark the number of feet that the sea rises and falls perpendicularly on new and full moon days. >> In addition, we find a lot of information here and there on the map on the map: no compass rose, but many lines of rumbs, four half flowers of lilies, northwest variation of the compass of 21 with precision: "North of the World and North of the magnet". Very detailed description of the seabed northwest of G uerne § Copy reproduced in C. Gaudillat, Anciennes Cartes Marines de la Bretagne 1580-1800, Pl. N°69.