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

Table of Notes

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          <pb o="174" file="188" n="188" rhead="CONSTRUCT. ET USAGES DES INSTRUMENS"/>
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        <div xml:id="echoid-div453" type="section" level="1" n="217">
          <head xml:id="echoid-head330" style="it" xml:space="preserve">Pour tracer ſur le papier un Plan fortifié, ſuivant la métbode
            <lb/>
          du Comte de 'Pagan.</head>
          <p>
            <s xml:id="echoid-s5632" xml:space="preserve">SOit, par exemple, propoſé un Exagone: </s>
            <s xml:id="echoid-s5633" xml:space="preserve">tracez premierement
              <lb/>
              <note position="left" xlink:label="note-188-01" xlink:href="note-188-01a" xml:space="preserve">Planche
                <lb/>
              A.
                <lb/>
              Fig. 1.</note>
            la ligne AB de 120 toiſes, pour côté extericur dudit Exagone;
              <lb/>
            </s>
            <s xml:id="echoid-s5634" xml:space="preserve">ſur le point du milieu C, tirez à angles droits la ligne CD,
              <lb/>
            de 30 toiſes; </s>
            <s xml:id="echoid-s5635" xml:space="preserve">tirez énſuite les lignes ADH, BDG, s'entre-cou-
              <lb/>
            pantes au point D, prenez ſur vôtre Echelle 55 toiſes, pour déter-
              <lb/>
            miner la longueur des faces AE, BF; </s>
            <s xml:id="echoid-s5636" xml:space="preserve">du point E tirez le flanc EG
              <lb/>
            faiſant angle droit au point G, à l'extremité de la ligne de défenſe
              <lb/>
            razante BG, & </s>
            <s xml:id="echoid-s5637" xml:space="preserve">pareillement l'autre flanc FH a angle droit ſur AH; </s>
            <s xml:id="echoid-s5638" xml:space="preserve">
              <lb/>
            tirez enfin la Courtine GH, & </s>
            <s xml:id="echoid-s5639" xml:space="preserve">vousaurez un côté dudit Exagone
              <lb/>
            fortifié: </s>
            <s xml:id="echoid-s5640" xml:space="preserve">les autres côtez ſe fortifieront de même. </s>
            <s xml:id="echoid-s5641" xml:space="preserve">Autour de ce côté
              <lb/>
            de Polygone ainſi fortifié, vous tracerez un Foſſé ici repreſenté par
              <lb/>
            les lignes AC, CB, paralleles aux faces des Baſtions, leſquelles
              <lb/>
            ſe rencontrent vers le milieu de la Courtine au point C: </s>
            <s xml:id="echoid-s5642" xml:space="preserve">ce Foſſé
              <lb/>
            doit avoir de largeur au moins 20 toiſes vis-à-vis les faces, & </s>
            <s xml:id="echoid-s5643" xml:space="preserve">3
              <lb/>
            toiſes de profondeur. </s>
            <s xml:id="echoid-s5644" xml:space="preserve">Les terres qui ſe tireront du Foſſé, ſerviront
              <lb/>
            à former le Rempartavec ſon Parapet & </s>
            <s xml:id="echoid-s5645" xml:space="preserve">le Glacis du Chemin cou-
              <lb/>
            vert, ayant ſoin de conſerver les terres les plus fines pour le Parapet
              <lb/>
            du corps de la Place & </s>
            <s xml:id="echoid-s5646" xml:space="preserve">celui du Chemin couvert; </s>
            <s xml:id="echoid-s5647" xml:space="preserve">car ſi ces terres
              <lb/>
            étoient pierreuſes, les boulets de canon tirez par les Aſſiegeans con-
              <lb/>
            tre ces Parapets, feroient ſauter les pierres, & </s>
            <s xml:id="echoid-s5648" xml:space="preserve">accableroient les Sol-
              <lb/>
            dats qui défendentle corps de la Place: </s>
            <s xml:id="echoid-s5649" xml:space="preserve">au contraire, quand ces ter-
              <lb/>
            res ſont fines & </s>
            <s xml:id="echoid-s5650" xml:space="preserve">épurées de pierres, le boulet ne fait que ſon trou & </s>
            <s xml:id="echoid-s5651" xml:space="preserve">s'y
              <lb/>
            enterre, pourvû toutefois qu'il y ait aſſez d'épaiſſeur pour l'amortir. </s>
            <s xml:id="echoid-s5652" xml:space="preserve">
              <lb/>
            L'experience a ſait connoître qu'il faut environ 20 pieds d'épaiſſeur
              <lb/>
            de terre bien battuë, poùr mettre un parapet à l'épreuve du canon.</s>
            <s xml:id="echoid-s5653" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5654" xml:space="preserve">Le Parapet ſe conſtruit ſur le Rempart large de 4 toiſes, y com-
              <lb/>
            pris la Banquette, & </s>
            <s xml:id="echoid-s5655" xml:space="preserve">ſe trace parallele aux faces, flancs & </s>
            <s xml:id="echoid-s5656" xml:space="preserve">courtines
              <lb/>
            qui forment l'enceinte de la place.</s>
            <s xml:id="echoid-s5657" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5658" xml:space="preserve">Mais pour le Rempart on lui donne 15 toiſes de largeur par ſa
              <lb/>
            baſe, & </s>
            <s xml:id="echoid-s5659" xml:space="preserve">on le trace parallele aux Courtines ſeulement, afin que
              <lb/>
            les Baſtions ſoient pleins, & </s>
            <s xml:id="echoid-s5660" xml:space="preserve">que l'on y trouve de la terre quand on
              <lb/>
            en a beſoin pour faire quelque retranchement.</s>
            <s xml:id="echoid-s5661" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5662" xml:space="preserve">Quand on laiſſe quelque Baſtion vuide, on y conſtruit des ſous-
              <lb/>
            terrains bien voutez, à l'êpreuve de bombe, que l'on recouvre de
              <lb/>
            terre bien battuë, & </s>
            <s xml:id="echoid-s5663" xml:space="preserve">on tâche de faire en ſorte que l'eau de pluie
              <lb/>
            n'en penetre point les voutes, afin que les proviſions que l'on ſerrera
              <lb/>
            dans ces ſous-terrains s'y puiſſent conſerver en tout tems.</s>
            <s xml:id="echoid-s5664" xml:space="preserve"/>
          </p>
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