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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<
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ſoutenus ſur
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des ſurfaces.</
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<
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XIX.</
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la charge du plan GH, ſont entr’eux comme les li-
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<
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gnes BD, BA, & </
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<
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<
s
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puiſſance R eſt parallele au plan GH, & </
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<
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ce poids parallele auſſi à HK hauteur de ce plan: </
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<
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">ce
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poids, cette puiſſance, & </
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<
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">la charge de ce même plan,
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ſeront entr’eux comme la longueur de ce plan, ſa hau-
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teur, & </
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<
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">c’eſt-à-dire, comme GH, HK, & </
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KG; </
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<
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">parce qu’alors les triangles GHK, & </
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">DBA ſont
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ſemblables.</
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</
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<
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XX.</
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<
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<
s
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xml:space
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">Et pour la même raiſon, ſi cette ligne de direction
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AB eſt parallele à l’horizon; </
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<
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">c’eſt-à-dire, à la baze
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GK de ce plan; </
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">& </
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<
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">que AC ſoit encore parallele à ſa
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hauteur HK: </
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<
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xml:space
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">Ce poids, cette puiſſance, & </
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<
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">la charge
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de ce plan, ſeront alors entr’eux comme la baze de
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de ce plan, ſa hauteur, & </
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<
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comme GK, KH, HG; </
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<
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GKH, & </
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<
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</
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<
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">Fuſqu’ici nous n’avons regardé le même poids que comme
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appliqué au même endroit d’un plan toujours également incli-
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né: </
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">Mais s’il ſe trouvoit ſucceſſivement en différens points,
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qu’arriveroit-il? </
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<
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XXI.</
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<
s
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38.</
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P & </
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A, ou des poids égaux ſur les points O, & </
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<
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même plan HG, ſont entr’elles en raiſon compoſée
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de celles des ſinus des angles QAD, & </
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& </
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