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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) (14598002290).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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ns nous tromper, nonleuleuent de quelques pieds, mais encorefouvent de quelques toifes -, ceux qui veu-lent eftre plus exads, fupputent par Tri-gonométrie , la grandeur des Angles, &des lignes. Or la Trigonométrie luppofètoujours trois chofes cogneuës de diverfe t^o Traité des FortifcatioriS, eipecedâns un Triangle, pour connoiftrcles autres j par exeir.ple deux codes ^ 5c unAngle -, ou deux Angles, & un codé: JoîUs du centre. o iij. iv. V. Vj. vij. 120. 50. 7^. 60. 51. i viij. ix. X. xj. xij. 45. 40. je. 51^^ so- Angles du Polygone y iij. iv. V. vj. vij.60. 90. 108 110. ii8 54.viij. ix. X. ^j. xij. iSy i^o. 144. 147. 16 150. JPa^x^x Tuvnche,
Text Appearing After Image:
Livre fécond, î^t PROPOSITION XXVI. TrouverV Anale flanque JAngle di/ninué^ l An^le flanquant interne ^ externe & l Angle de lEfpaule. lAngle flanqué eft différent daftsdiver- P/.i-... Tes manières d~: fortifier. Selon la me- &• 39^thode Françoife cet Angle eft de foixantedcgrcz dans un quatre j ôc de cent huitdans un Pentagone. LAngle flanquanteftde quatorze dcgrez trois min. Car puis-que le flanc, eft la fixieme partie du cofté ,il fera par confequentla quatrième partiede la Courtine. Suppofez que dans la fi-gure , DH foit toute la Courtine, & CDle flan.: ^ dans le Triangle redtangle HDC,fi DH eft fuppole Sinus total, DC (era laTangente de lAngle CHD. Faites donccomme D H à CD , ceft à dire comme^. ài.Ainfi le Sinus total à une Tangen-te , &:vous trouverez Ix Tangente de 14.degrés 6c trois min. Ce qui vous fera con-noiftre TAngleflanquant interieurDHC^auquel lAngle diminué LBC eft alterne,& par confequent égal ( parla 2j. du r.dEucl. ) Il eft d

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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:201
  • bookcollection:getty
  • bookcollection:americana
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30 July 2014
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