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-s8061" xml:space="preserve">
                <pb o="66" file="0380" n="406" rhead="LA SCIENCE DES INGENIEURS,"/>
              eſſentiels, où j’ai fait un paralelle de ſes maximes, avec les loix de
                <lb/>
              la mécanique, j’ai remarqué que l’un & </s>
              <s xml:id="echoid-s8062" xml:space="preserve">l’autre étoient preſque toû-
                <lb/>
              jours d’accord. </s>
              <s xml:id="echoid-s8063" xml:space="preserve">Un ſuccès ſi heureux doit être attribué, (comme
                <lb/>
              je l’ai ouï dire à Mr. </s>
              <s xml:id="echoid-s8064" xml:space="preserve">le Comte de Vauban ſon neveu) aux con-
                <lb/>
              noiſſances qu’il tiroit de l’examen des anciens Edifices, & </s>
              <s xml:id="echoid-s8065" xml:space="preserve">au plai-
                <lb/>
              ſir qu’il prenoit de ſe communiquer ſouvent avec les plus habiles
                <lb/>
              Geometres, & </s>
              <s xml:id="echoid-s8066" xml:space="preserve">même avec les ouvriers, dès qu’il leur apercevoit
                <lb/>
              quelque merite: </s>
              <s xml:id="echoid-s8067" xml:space="preserve">il propoſoit des problêmes aux uns, & </s>
              <s xml:id="echoid-s8068" xml:space="preserve">des diffi-
                <lb/>
              cultés aux autres, ſouvent après les avoir reſolus lui-même; </s>
              <s xml:id="echoid-s8069" xml:space="preserve">ſa
                <lb/>
              grande capacité lui faiſoit developer les reſſorts de la theorie la
                <lb/>
              plus abſtraite, il ſuffiſoit qu’on s’énonçât clairement, & </s>
              <s xml:id="echoid-s8070" xml:space="preserve">qu’on le
                <lb/>
              conduiſit ſur les voyes, pour arriver ſouvent le premier au dernier
                <lb/>
              terme de la ſolution.</s>
              <s xml:id="echoid-s8071" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s8072" xml:space="preserve">Les choſes qui paroiſſent les plus parfaites, n’étant point exemp-
                <lb/>
              tes de quelques petites corrections, je voudrois pour plus de ſo-
                <lb/>
              lidité changer la diſpoſition des contreforts du Magaſin de Mr. </s>
              <s xml:id="echoid-s8073" xml:space="preserve">de
                <lb/>
              Vauban: </s>
              <s xml:id="echoid-s8074" xml:space="preserve">par exemple, au lieu de les faire de 6 pieds d’épaiſſeur & </s>
              <s xml:id="echoid-s8075" xml:space="preserve">de
                <lb/>
              4 de longueur, leur donner 6 pieds de queuë & </s>
              <s xml:id="echoid-s8076" xml:space="preserve">4 d’épaiſſeur, parce
                <lb/>
              qu’alors le bras de levier devenant plus long, la puiſſance reſiſtante
                <lb/>
              ſoutien droit beaucoup mieux la pouſſée de la Voûte; </s>
              <s xml:id="echoid-s8077" xml:space="preserve">& </s>
              <s xml:id="echoid-s8078" xml:space="preserve">comme
                <lb/>
              on ne ſauroit avoir un trop grand nombre de points d’apui, il ſe-
                <lb/>
              roit à propos, au lieu de quatre contreforts, d’en faire cinq de cha-
                <lb/>
              que côté, & </s>
              <s xml:id="echoid-s8079" xml:space="preserve">en ce cas il ſuffiroit de donner 6 pieds ou 6 & </s>
              <s xml:id="echoid-s8080" xml:space="preserve">demi
                <lb/>
              d’épaiſſeur aux pieds droits, puiſque ces contreforts étant ainſi diſ-
                <lb/>
              tribués, ils cauſeroient une reſiſtance d’environ un tiers au-deſſus
                <lb/>
              de celle qu’il faudroit, pour ſoutenir l’effort de la Voûte.</s>
              <s xml:id="echoid-s8081" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s8082" xml:space="preserve">Les piés-droits & </s>
              <s xml:id="echoid-s8083" xml:space="preserve">les contreforts n’ayant que peu d’élevation, & </s>
              <s xml:id="echoid-s8084" xml:space="preserve">
                <lb/>
              bien liés avec leurs fondemens, on peut regarder les points d’apuis
                <lb/>
              placés ſous l’extremité des fondemens de la queuë des contreforts,
                <lb/>
              & </s>
              <s xml:id="echoid-s8085" xml:space="preserve">non pas au rez-de-Chauſſée comme nous l’avons ſupoſé dans le
                <lb/>
              deuxiéme Livre: </s>
              <s xml:id="echoid-s8086" xml:space="preserve">c’eſt pourquoi, afin d’allonger encore plus le bras
                <lb/>
              de levier, je voudrois qu’on donnât beaucoup d’empatement aux
                <lb/>
              fondemens, les faiſant deborder de 2 pieds ou 2 & </s>
              <s xml:id="echoid-s8087" xml:space="preserve">demi, au-delà
                <lb/>
              du nud du mur, ramené au rez-de-Chauſſée par pluſieurs retraites,
                <lb/>
              comme on le voit par le cinquiéme deſſein de la 27 Planche, où
                <lb/>
                <note position="left" xlink:label="note-0380-01" xlink:href="note-0380-01a" xml:space="preserve">
                  <emph style="sc">Planch</emph>
                .
                  <lb/>
                27.
                  <lb/>
                  <emph style="sc">Fig</emph>
                . 5.</note>
              l’on remarquera que, pour aſſurer les points d’apuis, on les a éta-
                <lb/>
              blis ſur deux rangs de madriers; </s>
              <s xml:id="echoid-s8088" xml:space="preserve">on ne feroit pas mal d’en mettre
                <lb/>
              auſſi ſous les fondemens des longs côtés, afin de prevenir l’inega-
                <lb/>
              lité des affaiſſemens: </s>
              <s xml:id="echoid-s8089" xml:space="preserve">cette conſtruction ſeroit excellente, ſur-
                <lb/>
              tout dans un mauvais terrain, parce qu’il ſuffiroit de s’y aprofondir
                <lb/>
              de 5 à 6 pieds; </s>
              <s xml:id="echoid-s8090" xml:space="preserve">& </s>
              <s xml:id="echoid-s8091" xml:space="preserve">je puis bien aſſeurer que la dépenſe ne ſeroit pas </s>
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