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-s6639" xml:space="preserve">
                <pb o="16" file="0300" n="311" rhead="LA SCIENCE DES INGENIEURS,"/>
              près de même qualité & </s>
              <s xml:id="echoid-s6640" xml:space="preserve">coupées de façon que le fil du bois ſe
                <lb/>
              trouvât toûjours dans le même ſens par raport à la ſituation où il
                <lb/>
              devoit être poſé.</s>
              <s xml:id="echoid-s6641" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s6642" xml:space="preserve">On s’eſt ſervi de deux chevalets pour tenir lieu d’apui, & </s>
              <s xml:id="echoid-s6643" xml:space="preserve">l’on en a
                <lb/>
              percé la tête afin d’y paſſer des valets de fer pour ſerrer les Solives
                <lb/>
              par les deux bouts quand on le jugeroit à propos; </s>
              <s xml:id="echoid-s6644" xml:space="preserve">& </s>
              <s xml:id="echoid-s6645" xml:space="preserve">comme dans un
                <lb/>
              Arſenal tel que celui de la Fere, il y a un grand nombre de poids
                <lb/>
              de toute ſorte de peſanteur & </s>
              <s xml:id="echoid-s6646" xml:space="preserve">des machines pour les élever, j’ai
                <lb/>
              été à portée de faire pluſieurs de mes Experiences en aſſés grand
                <lb/>
              volume pour pouvoir ſervir de baſe aux conſequences que j’en ti-
                <lb/>
              rerai à la fin de ce Chapitre. </s>
              <s xml:id="echoid-s6647" xml:space="preserve">Comme il eſt difficile de rencontrer
                <lb/>
              du bois dont les morceaux quoique tirès d’une même piece ſoient
                <lb/>
              aſſés égaux en toutes choſes pour qu’il ne ſe rencontre pas de diffe-
                <lb/>
              rence qui rendroit la plûpart des Experiences équivoques ſi on n’y
                <lb/>
              prenoit garde, j’ai repeté chaque Experience trois fois avec des
                <lb/>
              pieces de mêmes dimenſions, enſuite j’ai ajoûté enſemble les poids
                <lb/>
              que chacune à portée, & </s>
              <s xml:id="echoid-s6648" xml:space="preserve">le tiers de la ſomme m’a donné un nom-
                <lb/>
              bre qui peut exprimer la force moyenne, & </s>
              <s xml:id="echoid-s6649" xml:space="preserve">c’eſt ce nombre que
                <lb/>
              l’on trouve à côté de l’accolade chaque Experience.</s>
              <s xml:id="echoid-s6650" xml:space="preserve"/>
            </p>
            <p>
              <s xml:id="echoid-s6651" xml:space="preserve">Il eſt bon que j’avertiſſe, que quand je dirai qu’une Solive a tant
                <lb/>
              de longueur, on doit entendre que cette longueur eſt compriſe en-
                <lb/>
              tre les deux apuis, puiſqu’il n’eſt pas neceſſaire de faire mention des
                <lb/>
              trois ou quatre pouces qu’on a donné de plus à leur bouts pour re-
                <lb/>
              poſer ſur les apuis. </s>
              <s xml:id="echoid-s6652" xml:space="preserve">J’ajoûterai auſſi, qu’on n’a point eû égard à la pé-
                <lb/>
              ſanteur des Solives, & </s>
              <s xml:id="echoid-s6653" xml:space="preserve">que dans l’aplication que nous ferons de ces
                <lb/>
              Experiences aux poutres, on fera auſſi abſtraction de leur poids
                <lb/>
              pour rendre les calculs moins compoſés.</s>
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            <head xml:id="echoid-head251" style="it" xml:space="preserve">Premiere Experience.</head>
            <p>
              <s xml:id="echoid-s6655" xml:space="preserve">Une Solive de 18 pouces de longueur & </s>
              <s xml:id="echoid-s6656" xml:space="preserve">d’un pouce en quarré,
                <lb/>
              poſée ſur deux apuis, ſans être ſerrée par ſes extrêmités, a porté</s>
            </p>
            <note position="right" xml:space="preserve">dans ſon milieu un moment avant de ſe caſſer. . # 400 # { # liv.
              <lb/>
            Une ſeconde ſemblablement poſée. . . # 415 # # 406
              <lb/>
            Une troiſiéme ſemblable en tout aux précedentes # 405
              <lb/>
            </note>
            <p>
              <s xml:id="echoid-s6657" xml:space="preserve">Cette experience s’accorde aſſés bien avec la douziéme raportée
                <lb/>
              par Mr. </s>
              <s xml:id="echoid-s6658" xml:space="preserve">Parent, dans les Memoires del’Academie Royale des Scien-
                <lb/>
              ces de l’année 1707. </s>
              <s xml:id="echoid-s6659" xml:space="preserve">où il dit qu’une piece de bois de chêne de
                <lb/>
              24 pouces de longueur ſur un pouce en quarré a porté 300 liv.
                <lb/>
              </s>
              <s xml:id="echoid-s6660" xml:space="preserve">dans ſon milieu un moment avant de ſe rompre; </s>
              <s xml:id="echoid-s6661" xml:space="preserve">& </s>
              <s xml:id="echoid-s6662" xml:space="preserve">comme la
                <lb/>
              nôtre de 81 pouces avoit pour longueur les trois quarts de celle </s>
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