Bion, Nicolas
,
Traité de la construction et principaux usages des instruments de mathématique
,
1723
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<
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xml:space
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">DE LA
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CONSTRUCTION
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ET DES USAGES
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DES INSTRUMENS
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QUI SERVENT
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A LA NAVIGATION.
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LIVRE SEPTIÉME.</
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">CHAPTRE PREMIER.</
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<
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style
="
it
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">Di la Conſtruction & des Uſages de la Bouſſole Marine.</
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<
s
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xml:space
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">LA figure premiere repreſente une roſe de Bouſſole que
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">XIX.
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Planche.
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Fig. 12</
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les Marins nomment auſſi Compas de Route. </
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">Son
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bord extérieur repréſente l'horiſon du Monde. </
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<
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">ll
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ſe diviſé quelquefois en 360 deg. </
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xml:space
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">& </
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<
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xml:space
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">le plus ſouvent
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n'eſt diviſé qu'en 32 parties égales comme celle-ci,
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pour les 32 airs de vent, dont les quatre principaux & </
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<
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nomment vents cardinaux, ſe croiſent à angles droits; </
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Nord ou Septentrion, lequel ſe diſtingue par une Fleur-de-L ys, le
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Sud ou Midi qui lui eſt oppoſé; </
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cident. </
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">Diviſant enſuite chacun de ces eſpaces en deux parties éga-
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les, on a les 8 rumbs de vent; </
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on a les 8 demi-rumbs; </
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<
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">enſin ſubdiviſant chacune de ces 8 par-
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ties en 2, on a les 16 quarts de vent. </
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">Les 4 rumbs collateraux em-
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pruntent leurs noms des 4 principaux, chacun prenant pour nom
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les deux noms de ceux qui leur ſont plus proches; </
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eſt au milieu entre le Nord & </
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entre le Sud & </
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