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="19" file="0303" n="314" rhead="LIVRE IV. DES EDIFICES MILITAIRES."/>
              le bois n’étoit pas tout-à-fait ſi bon que celui de la premiere Ex-
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              perience.</s>
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          <div xml:id="echoid-div319" type="section" level="2" n="110">
            <head xml:id="echoid-head256" style="it" xml:space="preserve">Sixiéme Experience.</head>
            <p>
              <s xml:id="echoid-s6718" xml:space="preserve">Une Solive de trois pieds de longueur & </s>
              <s xml:id="echoid-s6719" xml:space="preserve">d’un pouce en quarré,</s>
            </p>
            <note position="right" xml:space="preserve">arrêtée par les deux bouts, a porté. . . # 285 # } # liv.
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            Une ſeconde poſée de même. . . . # 280 # # 283
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            Une troiſiéme. . . . . . # 285
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            <p>
              <s xml:id="echoid-s6720" xml:space="preserve">Les Solives de cette Experience ſe ſont rompuës en trois endroits
                <lb/>
              comme dans la ſeconde, & </s>
              <s xml:id="echoid-s6721" xml:space="preserve">leur force moyenne n’a été qu’à 283
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              au lieu de 300 pour être dans le même raport avec la ſeconde Ex-
                <lb/>
              perience; </s>
              <s xml:id="echoid-s6722" xml:space="preserve">mais il n’eſt preſque pas poſſible que les Experiences puiſ-
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              ſent donner juſte ce que l’on devroit en attendre par raport à celles
                <lb/>
              qui ont été faites les premieres: </s>
              <s xml:id="echoid-s6723" xml:space="preserve">cependant l’on peut encore remar-
                <lb/>
              quer ici que la force moyenne des Solives de la 6
                <emph style="sub">e</emph>
              Experience eſt à
                <lb/>
              celle des Solives de la 5
                <emph style="sub">e</emph>
              , à peu près comme 3 à 2, puiſqu’il ne s’en
                <lb/>
              faut que trois unités que ce raport ſoit exact, par conſequent
                <lb/>
              c’eſt un ſurcroît de preuve que les poutres qui ne ſont poſées ſeule-
                <lb/>
              ment que ſur deux apuis ont moins de force d’un tiers que celles
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              qui ſont ſerrées par les bouts.</s>
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            <head xml:id="echoid-head257" style="it" xml:space="preserve">Septiéme Experience.</head>
            <p>
              <s xml:id="echoid-s6725" xml:space="preserve">Une Solive de trois pieds de long ſur deux pouces en quarré, non</s>
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            <note position="right" xml:space="preserve">ar rêtée par les deux bouts, a porté. . . # 1550 # } # liv.
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            Une ſeconde ſemblable & poſée de même. . # 1620 # # 1585
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            Une troiſieme. . . . . . # 1250
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              <s xml:id="echoid-s6726" xml:space="preserve">La premiere & </s>
              <s xml:id="echoid-s6727" xml:space="preserve">la ſeconde Solive de cette Experience ont porté
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              à peu près le poids qui devoit exprimer leur force par raport à la
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              premiere & </s>
              <s xml:id="echoid-s6728" xml:space="preserve">la cinquiéme Experience; </s>
              <s xml:id="echoid-s6729" xml:space="preserve">cependant la premiere Solive
                <lb/>
              a porté 50 liv. </s>
              <s xml:id="echoid-s6730" xml:space="preserve">de moins & </s>
              <s xml:id="echoid-s6731" xml:space="preserve">la ſeconde 20 liv. </s>
              <s xml:id="echoid-s6732" xml:space="preserve">de plus, puiſque le
                <lb/>
              poids devoit être de 1600 liv.</s>
              <s xml:id="echoid-s6733" xml:space="preserve">: quant à la troiſieme Solive, il s’en faut
                <lb/>
              beaucoup qu’elle ait eû toute ſa force, puiſqu’elle n’a porté que
                <lb/>
              1250 liv.</s>
              <s xml:id="echoid-s6734" xml:space="preserve">; il eſt vrai qu’elle a paru défectueuſe avant même d’en
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              avoir fait uſage, & </s>
              <s xml:id="echoid-s6735" xml:space="preserve">on n’a pas été ſurpris de ce qui eſt arrivé.
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              <s xml:id="echoid-s6736" xml:space="preserve">Cependant, comme il ne reſtoit point de bois debité ſelon ces di-
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              menſions-là, j’ai ſupoſé, pour trouver la force moyenne, que la troi-
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              ſiéme Solive avoit porté la moitié de la ſomme des poids de la
                <lb/>
              premiere & </s>
              <s xml:id="echoid-s6737" xml:space="preserve">de la ſeconde.</s>
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