Bion, Nicolas, Traité de la construction et principaux usages des instruments de mathématique, 1723

Table of Notes

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              <pb o="171" file="185" n="185" rhead="POUR LES FORTIFICATIONS. Liv. IV. Ch. VIII."/>
            extérieurs, & </s>
            <s xml:id="echoid-s5525" xml:space="preserve">que leurs complémens ſont les angles de la figure.</s>
            <s xml:id="echoid-s5526" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5527" xml:space="preserve">Remarquez auſſi que tous les angles de la figure pris enſenble
              <lb/>
            doivent faire deux fois autant d'angles droits, moins quatre, qu'elle
              <lb/>
            a de côtez. </s>
            <s xml:id="echoid-s5528" xml:space="preserve">Ainſi, par exemple, la figure de cet uſage ayant 5 côtez,
              <lb/>
            tous ſes angles ajoûtez enſemble font 540 deg. </s>
            <s xml:id="echoid-s5529" xml:space="preserve">ou 6 fois 90, ce qui
              <lb/>
            peut ſervir à prouver les operations.</s>
            <s xml:id="echoid-s5530" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5531" xml:space="preserve">Cette maniere de lever un plan paroît aſſez expeditive, mais il
              <lb/>
            y a bien de la difficulté de faire avec la Bouſſole des operations
              <lb/>
            fort exactes, à cauſe du fer caché qui ſe peut rencontrer dans les
              <lb/>
            lieux où l'on eſt obligé de la placer.</s>
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        <div xml:id="echoid-div449" type="section" level="1" n="214">
          <head xml:id="echoid-head326" xml:space="preserve">CHAPITRE VIII.</head>
          <head xml:id="echoid-head327" style="it" xml:space="preserve">Uſages des ſuſdits Inſtrumens de Mathematique, appliquez
            <lb/>
          à la Fortification des Places.</head>
          <p>
            <s xml:id="echoid-s5533" xml:space="preserve">LA Fortification eſt l'art de mettre un lieu en tel état, qu'un pe-
              <lb/>
            tit Corps de Troupes y puiſſe reſiſter avantageuſement à une
              <lb/>
            Armée conſiderable.</s>
            <s xml:id="echoid-s5534" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5535" xml:space="preserve">Les Maximes qui ſervent de fondement à l'art de fortifier, ſont
              <lb/>
            de certaines Regles generales établies par les Ingenieurs, fondées
              <lb/>
            ſur la raiſon & </s>
            <s xml:id="echoid-s5536" xml:space="preserve">ſur l'experience, dont nous parlerons ci-après.</s>
            <s xml:id="echoid-s5537" xml:space="preserve"/>
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          <p>
            <s xml:id="echoid-s5538" xml:space="preserve">L'Ingenieur principal ayant examineé l'étenduë & </s>
            <s xml:id="echoid-s5539" xml:space="preserve">la ſituation
              <lb/>
            du lieu que l'on veut fortifier, communique ſon deſſein par un
              <lb/>
            plan & </s>
            <s xml:id="echoid-s5540" xml:space="preserve">un profil, comme il paroît par la Planche (A); </s>
            <s xml:id="echoid-s5541" xml:space="preserve">à quoi il
              <lb/>
            ajoûte ordinairement un devis, c'eſt-à-dire, un diſcours qui ex-
              <lb/>
            plique l'ordre & </s>
            <s xml:id="echoid-s5542" xml:space="preserve">la qualité des Matériaux qui doivent y être em-
              <lb/>
            ployez par les Entrepreneurs; </s>
            <s xml:id="echoid-s5543" xml:space="preserve">leſquels ayant fait ſonder en pluſieurs
              <lb/>
            endroits du lieu propoſé, la nature du terrain, feront un Marché
              <lb/>
            de chaque toiſe d'ouvrage, par le moyen du quel l'ingenieur pour-
              <lb/>
            ra voir à peu près la depenſe de tout l'ouvrage, le nombre des
              <lb/>
            Oavriers neceſſaires pour l'execution, & </s>
            <s xml:id="echoid-s5544" xml:space="preserve">le tems qu'il conviendra
              <lb/>
            d'y employer pour le rendre parfait.</s>
            <s xml:id="echoid-s5545" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5546" xml:space="preserve">Le plan d'une fortification repreſente par pluſieurs lignes tra-
              <lb/>
            cées horiſontalement ou de niveau l'enceinte de la Place.</s>
            <s xml:id="echoid-s5547" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5548" xml:space="preserve">Ce deſſein contient pluſieurs lignes paralleles entr'elles, mais le
              <lb/>
            premier & </s>
            <s xml:id="echoid-s5549" xml:space="preserve">principal trait, qui doit être marqué par une ligne plus
              <lb/>
            apparente que les autres, repreſente la principale enceinte du corps
              <lb/>
            de la Place entre le Rempart & </s>
            <s xml:id="echoid-s5550" xml:space="preserve">le Foſſé: </s>
            <s xml:id="echoid-s5551" xml:space="preserve">de ſorte par le Plan & </s>
            <s xml:id="echoid-s5552" xml:space="preserve">ſon
              <lb/>
            Echelle on connoît les longueurs & </s>
            <s xml:id="echoid-s5553" xml:space="preserve">les largeurs de tous les Ou-
              <lb/>
            </s>
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