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

Table of Notes

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          <p>
            <s xml:id="echoid-s5728" xml:space="preserve">
              <pb o="177" file="191" n="191" rhead="POUR LES FORTIFICATIONS. Liv. IV. Ch. VIII."/>
            cette ſorte d'ouvrage; </s>
            <s xml:id="echoid-s5729" xml:space="preserve">c'eſt-à-dire, pour couper les gazons, & </s>
            <s xml:id="echoid-s5730" xml:space="preserve">
              <lb/>
            les placer comme il convient.</s>
            <s xml:id="echoid-s5731" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5732" xml:space="preserve">Au bas ou pied du talud extérieur du Parapet & </s>
            <s xml:id="echoid-s5733" xml:space="preserve">du Rempart,
              <lb/>
            on laiſſe une petite Berme marquée Q, d'environ 4 pieds de lar-
              <lb/>
            ge, pour retenir les terres qui peuvent ſe détacher du talud.</s>
            <s xml:id="echoid-s5734" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5735" xml:space="preserve">La pente QB repreſente le talud intérieur des terres du Foſſé,
              <lb/>
            qui a 3 toiſes de profondeur, BK en eſt le talud extérieur. </s>
            <s xml:id="echoid-s5736" xml:space="preserve">Si ces
              <lb/>
            terres ſont mouvantes, il faut leur donner aſſez de pente, pour
              <lb/>
            qu'elles reſtent ſans s'ébouler ou retomber dans le Foſſé. </s>
            <s xml:id="echoid-s5737" xml:space="preserve">Mais ſi
              <lb/>
            elles ſont fermes, & </s>
            <s xml:id="echoid-s5738" xml:space="preserve">qu'elles puiſſent facilement reſter ſans re-
              <lb/>
            tomber, on leur donne moins de talud. </s>
            <s xml:id="echoid-s5739" xml:space="preserve">La ligne K P repreſente
              <lb/>
            le Terre-plein du Chemin couvert, qui doit avoir 5 toiſes de lar-
              <lb/>
            geur. </s>
            <s xml:id="echoid-s5740" xml:space="preserve">P A repreſente le Parapet du Chemin couvert, avec ſa Ban-
              <lb/>
            quete au pied, le tout doit avoir 6 pieds de hauteur, pour mettre à
              <lb/>
            couvert ceux qui ſont ſur le Chemin couvert.</s>
            <s xml:id="echoid-s5741" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5742" xml:space="preserve">La pente ſupérieure du Glacis AN, doit être de terres douces,
              <lb/>
            dont on ôte les pierres, s'il y en a, avec un rateau de fer, & </s>
            <s xml:id="echoid-s5743" xml:space="preserve">on les
              <lb/>
            enterre au pied du Glacis, afin que quand l'Ennemi fera tirer le ca-
              <lb/>
            non ſur ledit Glacis, les boulets s'y enfoncent ſans faire réjaillir les
              <lb/>
            éclats de pierres dans le Chemin couvert.</s>
            <s xml:id="echoid-s5744" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div457" type="section" level="1" n="219">
          <head xml:id="echoid-head332" style="it" xml:space="preserve">Pour tracer le plan d'une Fortification ſur la Terre.</head>
          <p>
            <s xml:id="echoid-s5745" xml:space="preserve">SOit propoſé, par exemple, le Plan de la figure premiere, à tra-
              <lb/>
              <note position="right" xlink:label="note-191-01" xlink:href="note-191-01a" xml:space="preserve">Planche
                <lb/>
              A.</note>
            cer ſur la Terre.</s>
            <s xml:id="echoid-s5746" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5747" xml:space="preserve">Au lieu de Compas & </s>
            <s xml:id="echoid-s5748" xml:space="preserve">de Regle, il faut employer les Piquets, la
              <lb/>
              <note position="right" xlink:label="note-191-02" xlink:href="note-191-02a" xml:space="preserve">Fig. 1.</note>
            Toiſe & </s>
            <s xml:id="echoid-s5749" xml:space="preserve">les Cordeaux: </s>
            <s xml:id="echoid-s5750" xml:space="preserve">c'eſt pourquoi, après avoir bien examiné
              <lb/>
            le terrain, & </s>
            <s xml:id="echoid-s5751" xml:space="preserve">conſideré où l'on doit placer les Baſtions & </s>
            <s xml:id="echoid-s5752" xml:space="preserve">les Por-
              <lb/>
            tes, qui ſe font pour l'ordinaire au milieu des Courtines, il faut
              <lb/>
            premierement planter de longs piquets aux endroits où l'on pré-
              <lb/>
            tend placer les Angles flanquez des Baſtions, & </s>
            <s xml:id="echoid-s5753" xml:space="preserve">il eſt à propos d'y
              <lb/>
            faire toute l'attention neceſſaire, avant que de commencer.</s>
            <s xml:id="echoid-s5754" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5755" xml:space="preserve">Ayant done planté perpendiculairement un long piquet ſur le
              <lb/>
            Terrain, à l'endroit où l'on a reſolu de placer la pointe du Baſtion,
              <lb/>
            marquée A, on fera meſurer bien exactement avec une toiſe, ou
              <lb/>
            avec une chaîne de 5 toiſes, juſqu'à 90 toiſes au bout deſquelles
              <lb/>
            on plantera un piquet marqué C, & </s>
            <s xml:id="echoid-s5756" xml:space="preserve">l'on continuëra vers le lieu
              <lb/>
            où l'on prétend placer la pointe du Baſtion B, en meſurant encore
              <lb/>
            90 toiſes, ou bout deſquelles on plantera un autre piquet, qui
              <lb/>
            marquera la pointe du Baſtion B.</s>
            <s xml:id="echoid-s5757" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s5758" xml:space="preserve">Pendant que l'on meſurera avec les Chaînes ou Cordeaux, il
              <lb/>
            </s>
          </p>
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