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

Table of Notes

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        <div xml:id="echoid-div502" type="section" level="1" n="242">
          <pb o="206" file="221" n="221" rhead="CONSTRUCT. ET USAGES DES INSTRUMENS"/>
        </div>
        <div xml:id="echoid-div503" type="section" level="1" n="243">
          <head xml:id="echoid-head362" style="it" xml:space="preserve">Du Compas à pointes courbes.</head>
          <p>
            <s xml:id="echoid-s6511" xml:space="preserve">CE Compas ne differe point pour la conſtruction des autres com-
              <lb/>
              <note position="left" xlink:label="note-221-01" xlink:href="note-221-01a" xml:space="preserve">Fig. C.</note>
            pas dont nous avons parlé ci-devant, ſinon que l'on démonte
              <lb/>
            les pointes des 2 côtez pour en placer de courbes, qui ſervent à
              <lb/>
            prendre la groſſeur des boulets & </s>
            <s xml:id="echoid-s6512" xml:space="preserve">à les rapporter ſur la regle de ca-
              <lb/>
            libre, afin d'en connoître le poids. </s>
            <s xml:id="echoid-s6513" xml:space="preserve">Mais quand on veut connoître
              <lb/>
            le calibre des pieces, on démonte les pointes courbes pour y en met-
              <lb/>
            tre de droites, avec leſquelles on prend les diametres des bouches
              <lb/>
            des canons, & </s>
            <s xml:id="echoid-s6514" xml:space="preserve">enſuite on les rapporte ſur la ligne du calibre des
              <lb/>
            pieces, qui eſt auſſi marquée ſur la regle, & </s>
            <s xml:id="echoid-s6515" xml:space="preserve">par ce moyen on con-
              <lb/>
            noîtra le poids du boulet convenable à la piece de canon.</s>
            <s xml:id="echoid-s6516" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div505" type="section" level="1" n="244">
          <head xml:id="echoid-head363" style="it" xml:space="preserve">Conſtruction de l' Inſtrument à pointer les Canons & les Mortiers.</head>
          <p>
            <s xml:id="echoid-s6517" xml:space="preserve">CEt inſtrument eſt compoſé d'une plaque de cuivre triangulaire
              <lb/>
              <note position="left" xlink:label="note-221-02" xlink:href="note-221-02a" xml:space="preserve">Fig. D.</note>
            d'environ 4 pouces de hauteur, au bas de laquelle eſt une por-
              <lb/>
            tion de cercle, diviſée en 45 deg. </s>
            <s xml:id="echoid-s6518" xml:space="preserve">ce nombre étant ſuffiſant pour ti-
              <lb/>
            rer une piece à toute volée, & </s>
            <s xml:id="echoid-s6519" xml:space="preserve">donner au boulet la plus longue por-
              <lb/>
            tée, comme nous expliquerons ci-après. </s>
            <s xml:id="echoid-s6520" xml:space="preserve">Il y a une piece de cuivre
              <lb/>
            attachée au centre de la portion de cercle avec une vis pour la reſ-
              <lb/>
            ſerrer ou lui donner un mouvement libre ſelon les beſoins.</s>
            <s xml:id="echoid-s6521" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6522" xml:space="preserve">Cette piece eſt renforcée par le bas pour ſervir de plomb, elle eſt
              <lb/>
            pointuë par le bout, afin de marquer ſur les deg. </s>
            <s xml:id="echoid-s6523" xml:space="preserve">les differentes ele-
              <lb/>
            vations des pieces d'Artillerie. </s>
            <s xml:id="echoid-s6524" xml:space="preserve">Il y a auſſi une eſpece de pied de cui-
              <lb/>
            vre quis'a puie ſur les Mortiers & </s>
            <s xml:id="echoid-s6525" xml:space="preserve">Canons, en ſorte que tout l'inſtru-
              <lb/>
            ment ſe tient perpendiculaire quand la piece eſt placée horiſontale-
              <lb/>
            ment.</s>
            <s xml:id="echoid-s6526" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6527" xml:space="preserve">Son uſage eſt fort facile, il n'y a qu'à poſer le pied ſur la piece
              <lb/>
            qu'on éleve, de telle ſorte que la pointe du plomb donne ſur le degré
              <lb/>
            convenable, & </s>
            <s xml:id="echoid-s6528" xml:space="preserve">c'eſt ce qu'on nomme pointer une piece.</s>
            <s xml:id="echoid-s6529" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div507" type="section" level="1" n="245">
          <head xml:id="echoid-head364" style="it" xml:space="preserve">Dupied à Niveau pour l' Artillerie.</head>
          <p>
            <s xml:id="echoid-s6530" xml:space="preserve">L'Inſtrument marqué E, eſt nommé pied à Niveau. </s>
            <s xml:id="echoid-s6531" xml:space="preserve">Nous en a-
              <lb/>
              <note position="left" xlink:label="note-221-03" xlink:href="note-221-03a" xml:space="preserve">Fig. E.</note>
            vons donné la conſtruction en parlant des pieds & </s>
            <s xml:id="echoid-s6532" xml:space="preserve">des équer-
              <lb/>
            res; </s>
            <s xml:id="echoid-s6533" xml:space="preserve">quand on veut s'en ſervir pour l'artillerie, on diviſe la languete
              <lb/>
            qui ſert à le maintenir à angles droits, en 90 d. </s>
            <s xml:id="echoid-s6534" xml:space="preserve">ou plûtôt en 2 fois
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            45, dont le commencement ſe compte du milieu. </s>
            <s xml:id="echoid-s6535" xml:space="preserve">La ſoie qui porte
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            le plombeſt attachée au centre de cette diviſion. </s>
            <s xml:id="echoid-s6536" xml:space="preserve">Les 2 bouts desre-
              <lb/>
            gles de cet inſtrument ſont échancrez, de maniere que le plomb
              <lb/>
            tombe perpendiculairement ſur le milieu de la languete, lorſqu'il
              <lb/>
            eſt poſe de niveau.</s>
            <s xml:id="echoid-s6537" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s6538" xml:space="preserve">Pour s'en ſervir on poſe les deux bouts ſur les pieces d'artillerie,
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            que l'on éleve à la hauteur propoſée, par le moyen du plomb dont
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            la ſoie marque les degrez.</s>
            <s xml:id="echoid-s6539" xml:space="preserve"/>
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