File:L'art de fortifier, de defendre, et d'attaquer les places - suivant les methodes françoises, hollandoises, italiennes and espagnoles, le tout enrichy de figures en taille douce (1677) (14784383412).jpg

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Identifier: lartdefortifierd00dech (find matches)
Title: L'art de fortifier, de defendre, et d'attaquer les places : suivant les methodes françoises, hollandoises, italiennes & espagnoles, le tout enrichy de figures en taille douce
Year: 1677 (1670s)
Authors: Dechales, Claude-François Milliet, 1621-1678
Subjects: Fortification Military art and science
Publisher: A Paris : Chez Estienne Michallet ...
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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fautchercher le centre de cette figure, ceft àdireje centre du plus grand triangle GHK,faifant (par U i$, dn ^.dEttcL ) paiïer uncercle par ces trois poinds GHK. Le demi-diametre de ce cercle eftant trouvé, vousle comparerez avec le demi-diametre desPolygones, que les Tables vous reprefen-tent. Par exemple, fuppofè que vous ayezpour demi-diametre de ce cercle cent toi-les; vous trouvez dans les Tables que ledemi-diametre du Pentagone eft de qua-tre-vingts-feize , celuy de lHexagone decent dix-fept *, doù vous pouvez conclure,que il vous changez cette figure en Penta-gone régulier, il ne fera point trop grand,ny aufli trop petit. Et jj le demi-diame-tre du cercle eftoir de deux cens toifes,ayant trouvé dans la Table deux cens qua-tre pour un Décagone , il faudroit changercette figure irreguliere en Décagone. Sup-pofons donc que ceft un Pentagone. Ayantdécrit un cercle du demi diamètre de centToifes, tracez un Pentagone régulier . vousVivant le plus que vous pourrez des co-
Text Appearing After Image:
Livre quatrième, 2?! ftcz propofez. Et pour le faire arec plusde facilité, décrivez fur un papier huilévoftre Pentagone reg^Lilier 5 prenant les me-Turcs fur la mefme Echelle dont vous vouscftes iervy, pour lever voftre Plan. Appli-quez fur voftre Plan, ce Pentagone décricfur le papier huilé, & le tournez jufquesà ce quil sajufte le mieux quil fe pourra,avec les coftez de la figure. Voftre Pentago-ne régulier eftant tracé, vous achèverezla Fortification par les pratiques, que jayexpliquées au fécond Livre , & que je nedois pas repeter inutilement. PROPOSITION XI. Fonifer une Place mal conditionnée. TOute figure qui a des Angles aigus, Vl jf.ne peut eftre fortifiée , quon ne h h97*change *, ce qui fe peut faire allez fouvenctres-facilement, comme nous verrons dansplufieurs exemples^ Quon propofe la figure A B D C , quiâ lecofté A B de cent cinquante-huit toi-fes, C Dde cent une , B D de cent vingt-deux i A C aufti , de cent vingt-d^ux \les Angies A & B , de

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Flickr tags
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  • bookid:lartdefortifierd00dech
  • bookyear:1677
  • bookdecade:1670
  • bookcentury:1600
  • bookauthor:Dechales__Claude_Fran__ois_Milliet__1621_1678
  • booksubject:Fortification
  • booksubject:Military_art_and_science
  • bookpublisher:A_Paris___Chez_Estienne_Michallet____
  • bookcontributor:Getty_Research_Institute
  • booksponsor:Getty_Research_Institute
  • bookleafnumber:383
  • bookcollection:getty
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014



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