Varignon, Pierre
,
Projet d' une nouvelle mechanique : avec Un examen de l' opinion de M. Borelli sur les propriétez des poids suspendus par des cordes
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DE M. BORELLI.
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Cl + Cn: </
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<
s
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xml:space
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<
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xlink:label
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note-0137-01
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note-0137-01a
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xml:space
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">DES POIDS
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lb
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ſoutenus avec
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des cordes ſeu-
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lement.</
note
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4°. </
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<
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<
s
xml:id
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xml:space
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">Donc Ck = Cm - Cg +
<
lb
/>
Cr + Cn - Cp. </
s
>
<
s
xml:id
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xml:space
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">Enfin continuant toujours ainſi
<
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juſqu’à la diagonale qui ſetrouve toujours ( Prop. </
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<
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">2.)
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</
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<
s
xml:id
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xml:space
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">dans la ligne de ditection du poids T, on trouvera
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de même que cette diagonale eſt toujours égale à
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Cm - Cg + Cr + Cn - Cp ± &</
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>
<
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<
s
xml:id
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xml:space
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de voir ( Prop. </
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<
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">2.) </
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<
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xml:space
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">que chacune des puiſſances A, B,
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D, E, F, &</
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<
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xml:id
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">c. </
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<
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">eſt auſſi toujours au poids T qu’elles
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ſoutiennent, comme chacune de leurs proportio-
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nelles CG, CR, CM, CN, CP, &</
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<
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<
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diagonale: </
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<
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xml:space
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">Donc chacune de ces puiſſances eſt à ce
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poids, comme chacune de ces proportionelles à Cm +
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Cr + Cn - Cg - Cp ± &</
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<
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<
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">C’eſt-à-dire, ( Def. </
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1. </
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">& </
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<
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<
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xml:space
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">à la ſomme de leurs ſublimitez Cm, Cr,
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Cn, &</
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<
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<
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">moins la ſomme de leurs profondeurs Cg,
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Cp, &</
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<
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<
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xml:space
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">D’où l’on voit en général, que de qu@lque
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maniére qu’un poids ſoit ſoutenu avec des cordes
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par quelque nombre de puiſſances que ce ſoit, appli-
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quées à un même nœud, chacune de ces puiſſances
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/>
eſt toujours à ce poids, comme chacune de leurs pro-
<
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portionelles, à la ſomme de leurs ſublimitez moins
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celle de leurs profondeurs. </
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trer.</
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<
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<
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&</
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<
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<
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">proportionelles aux puiſſances A, B, D, E, F,
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<
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&</
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<
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&</
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<
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<
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">concevez par le point C, où elles ſe communi-
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quent, un plan horizontal OH, c’eſt-à-dire, per-
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pendiculaire à la ligne de direction du poids T; </
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enſuite des extrémitez de ces proportionelles G, R,
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M, N, P, &</
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<
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plan OH, & </
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<
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indéfiniment prolongée de part & </
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