Bélidor, Bernard Forest de, La science des ingenieurs dans la conduite des travaux de fortification et d' architecture civile

Table of Notes

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          <pb o="45" file="0505" n="552" rhead="LIVRE V. DE LA DE’CORATION."/>
          <p>
            <s xml:id="echoid-s10453" xml:space="preserve">On a auſſi donné du renflement aux Colomnes à l’imitation du
              <lb/>
            corps humain, qui eſt plus large vers le milieu que vers les extré-
              <lb/>
            mitez: </s>
            <s xml:id="echoid-s10454" xml:space="preserve">mais, les Architectes ſont encore partagez ſur ce ſujet, parce
              <lb/>
            qu’on n’en a point d’exemple antique; </s>
            <s xml:id="echoid-s10455" xml:space="preserve">il y en a même, qui traitent
              <lb/>
            ce renflement d’abus inſuportable: </s>
            <s xml:id="echoid-s10456" xml:space="preserve">cependant, l’uſage de renfler les
              <lb/>
            Colomnes à leurs tiers eſt ſi pratiqué par les modernes, qu’on n’en
              <lb/>
            voit preſque point quine le ſoient: </s>
            <s xml:id="echoid-s10457" xml:space="preserve">c’eſt pourquoi on a cherché plu-
              <lb/>
            ſieurs moyens pour le faire agreablement; </s>
            <s xml:id="echoid-s10458" xml:space="preserve">car, moins il eſt ſenſible,
              <lb/>
            & </s>
            <s xml:id="echoid-s10459" xml:space="preserve">plus il eſt beau. </s>
            <s xml:id="echoid-s10460" xml:space="preserve">Or, pour ſavoir de quelle maniere on doit les
              <lb/>
            diminuer ou les renfler, voici les deux Pratiques que donne Vigno-
              <lb/>
            le, que je raporterai preferablement à pluſieurs autres qui ſont à la
              <lb/>
            verité moins mécaniques, mais plus difficiles à executer.</s>
            <s xml:id="echoid-s10461" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div465" type="section" level="1" n="123">
          <head xml:id="echoid-head336" style="it" xml:space="preserve">Maniere de diminuer les Colomnes.</head>
          <p>
            <s xml:id="echoid-s10462" xml:space="preserve">Après avoir déterminé la hauteur & </s>
            <s xml:id="echoid-s10463" xml:space="preserve">la groſſeur des Colomnes,
              <lb/>
              <note position="right" xlink:label="note-0505-01" xlink:href="note-0505-01a" xml:space="preserve">
                <emph style="sc">Planch</emph>
              .
                <lb/>
              48.</note>
            avec la quantité dont on veut qu’elle diminue depuis le tiers juſ-
              <lb/>
            qu’au haut, il faut d’écrire un demi-cercle ſur le diamêtre CD, en-
              <lb/>
            ſuite mener la parallele GE à l’Axe AB, enſorte qu’elle vienne ren-
              <lb/>
            contrer le demi-cercle au point E, afin d’avoir l’arc CE: </s>
            <s xml:id="echoid-s10464" xml:space="preserve">l’on divi-
              <lb/>
            ſera enſuite la ligne AM en un certain nombre de parties égales,
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            comme en 10 ou 12; </s>
            <s xml:id="echoid-s10465" xml:space="preserve">mais, je me contenterai de ne la diviſer ici
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            qu’en ſix, afin de rendre la figure moins confuſe: </s>
            <s xml:id="echoid-s10466" xml:space="preserve">il faut diviſer de
              <lb/>
            même l’Arc CE en autant de parties égales que la ligne AM, & </s>
            <s xml:id="echoid-s10467" xml:space="preserve">par
              <lb/>
            chaque point de diviſion mener des paralleles à l’Axe: </s>
            <s xml:id="echoid-s10468" xml:space="preserve">on menera
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            auſſi par les points I d’autres paralleles au diamêtre CD, qui, venant
              <lb/>
            rencontrer les précédentes, donneront les points K qui marqueront
              <lb/>
            de combien la Colomne doit diminuer. </s>
            <s xml:id="echoid-s10469" xml:space="preserve">Or, pour tracer cette dimi-
              <lb/>
            nution, il faut prendre une grande Regle flexible, & </s>
            <s xml:id="echoid-s10470" xml:space="preserve">la faire paſſer
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            par tous les points que la courbe doit rencontrer.</s>
            <s xml:id="echoid-s10471" xml:space="preserve"/>
          </p>
        </div>
        <div xml:id="echoid-div467" type="section" level="1" n="124">
          <head xml:id="echoid-head337" style="it" xml:space="preserve">Maniere de renfler les Colomnes.</head>
          <p>
            <s xml:id="echoid-s10472" xml:space="preserve">Ayant déterminé les meſures de la Colomne & </s>
            <s xml:id="echoid-s10473" xml:space="preserve">tiré le diamêtre
              <lb/>
            DE, qui doit paſſer par le tiers de l’Axe AB comme ci-devant, il
              <lb/>
            faut avec le Compas prendre le demi-diamêtre CE, (que je ſupoſe
              <lb/>
            égal à celui de la Colomne) & </s>
            <s xml:id="echoid-s10474" xml:space="preserve">le porter à l’extrémité G du diamê-
              <lb/>
            tre GH, enſorte que venant rencontrer l’Axe AB au point I, la
              <lb/>
            ligne GI ſoit égale au demi-diamêtre CE: </s>
            <s xml:id="echoid-s10475" xml:space="preserve">enſuite il faut prolonger
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            cette ligne auſſi-bien que le diamêtre DE, de maniere que l’un & </s>
            <s xml:id="echoid-s10476" xml:space="preserve">
              <lb/>
            l’autre, venant ſerencontrer, donnent le point F, duquel il faut tirer
              <lb/>
            un nombre de lignes qui viendront couper l’Axe de la Colomne, </s>
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