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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            <s xml:id="echoid-s10662" xml:space="preserve">Les Frontons augmentent auſſi beaucoup la beauté des façades
              <lb/>
            lorſqu’ils ſont mis à propos; </s>
            <s xml:id="echoid-s10663" xml:space="preserve">mais, pour qu’ils ayent plus de grace,
              <lb/>
            il faut que le corps qui en eſt couronné faſſe quelque ſaillie, afin
              <lb/>
            de ſe diſtinguer & </s>
            <s xml:id="echoid-s10664" xml:space="preserve">maîtriſer les autres parties continuées de l’Edifice.</s>
            <s xml:id="echoid-s10665" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s10666" xml:space="preserve">Selon Scamozzy, pour avoir la plus belle proportion des Fron-
              <lb/>
              <note position="left" xlink:label="note-0512-01" xlink:href="note-0512-01a" xml:space="preserve">
                <emph style="sc">Planch</emph>
              .
                <lb/>
              48.</note>
            tons, il faut diviſer la Corniche AB qui lui ſert de Baſe en neuf
              <lb/>
            parties égales, & </s>
            <s xml:id="echoid-s10667" xml:space="preserve">en donner deux à la perpendiculaire EC, pour
              <lb/>
            déterminer la hauteur qu’il doit avoir depuis l’Entablement juſqu’au
              <lb/>
            ſommet; </s>
            <s xml:id="echoid-s10668" xml:space="preserve">cette proportion étant plus agréable à la vûë, que de lui
              <lb/>
            donner pour hauteur la cinquiéme partie de la Baſe comme font
              <lb/>
            quelques Architectes, & </s>
            <s xml:id="echoid-s10669" xml:space="preserve">plus commode pour faciliter l’écoulement
              <lb/>
            des eaux. </s>
            <s xml:id="echoid-s10670" xml:space="preserve">On peut auſſi tracer un cercle dont la Baſe AB ſervira de
              <lb/>
            diamêtre que l’on diviſera en deux également, par la perpendicu-
              <lb/>
            laire DF & </s>
            <s xml:id="echoid-s10671" xml:space="preserve">du point D comme centre, & </s>
            <s xml:id="echoid-s10672" xml:space="preserve">de l’intervale DA, on
              <lb/>
            décrira l’arc ACB qui venant couper la perpendiculaire au point C,
              <lb/>
            on n’aura qu’à tracer l’angle ACB, qui donnera celui qui doit for-
              <lb/>
            mer le Fronton. </s>
            <s xml:id="echoid-s10673" xml:space="preserve">L’on remarquera que cet angle eſt égal à celui
              <lb/>
            de la circonference d’un Octogonne, puiſque le point D, étant
              <lb/>
            le centre de l’arc que l’on a décrit, les deux rayons DA & </s>
            <s xml:id="echoid-s10674" xml:space="preserve">DB,
              <lb/>
            forment un angle droit.</s>
            <s xml:id="echoid-s10675" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s10676" xml:space="preserve">Il ſe fait auſſi des Frontons en portion de cercle qui ont la même
              <lb/>
            hauteur que les Triangulaires, puiſque l’Arc AGHB, qui en dé-
              <lb/>
            termine la figure, doit avoir pour centre le point D, dont nous
              <lb/>
            nous ſommes ſervi pour le précédent: </s>
            <s xml:id="echoid-s10677" xml:space="preserve">on peut donc dire, que les
              <lb/>
            Frontons ronds ſont compoſés d’un ſecment de cercle qui com-
              <lb/>
            prend le quart de la circonference.</s>
            <s xml:id="echoid-s10678" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s10679" xml:space="preserve">Quand on a un rang de Fenêtres ſur un même alignement, & </s>
            <s xml:id="echoid-s10680" xml:space="preserve">
              <lb/>
            qu’on veut les couronner par des Frontons, il faut pour les varier les
              <lb/>
            faire alternativement ronds & </s>
            <s xml:id="echoid-s10681" xml:space="preserve">triangulaires; </s>
            <s xml:id="echoid-s10682" xml:space="preserve">enſorte qu’ils répon-
              <lb/>
            dent avec ſimétrie à droit & </s>
            <s xml:id="echoid-s10683" xml:space="preserve">à gauche du milieu de la façade, ainſi
              <lb/>
            qu’on l’a pratiqué à la Gallerie du Louvre & </s>
            <s xml:id="echoid-s10684" xml:space="preserve">aux Thuileries. </s>
            <s xml:id="echoid-s10685" xml:space="preserve">Ce-
              <lb/>
            pendant, quoique ce Bâtiment ſoit des plus magnifiques, & </s>
            <s xml:id="echoid-s10686" xml:space="preserve">qu’on
              <lb/>
            pourroit le citer pour exemple en bien des choſes, je ne ſaurois
              <lb/>
            m’empêcher de dire qu’il eſt ridicule de voir qu’on ait affecté d’y
              <lb/>
            mettre une ſi grande quantité de Frontons: </s>
            <s xml:id="echoid-s10687" xml:space="preserve">les choſes qui réüſſiſſent
              <lb/>
            le mieux ont beſoin d’être menagées; </s>
            <s xml:id="echoid-s10688" xml:space="preserve">autrement, quand elles ſont
              <lb/>
            trop repetées, elles apportent plus de confuſion que d’agrément.</s>
            <s xml:id="echoid-s10689" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s10690" xml:space="preserve">Soit qu’on faſſe les Frontons triangulaires ou circulaires, la Cor-
              <lb/>
            niche qui couronne le timpan doit toûjours être ſemblable à celle
              <lb/>
            de l’Entablement: </s>
            <s xml:id="echoid-s10691" xml:space="preserve">il faut ſeulement remarquer, que la partie de la
              <lb/>
            Corniche qui ſert de Baſe au Fronton doit être ſans Cymaiſe, par- </s>
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