Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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ſemper haberet ſuum effectum; </
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<
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">igitur non eſſet fruſtrà; igitur per Schol.
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Th.152.l.1. </
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Theorema
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60.
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Ille motus acceleratur per partes inæquales
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; </
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<
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">quia ſcilicet motus additus
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in O minor eſſet quàm in N, & in G quàm in O per Th. 56. igitur per
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partes inæquales acceleraretur, immò poteſt determinari proportio cre
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menti motus in ſingulis; </
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<
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">cum enim in O ſit vt YP, in QL. in Yvt T
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ad AC; certè creſcit in proportione ſinuum rectorum ad ſinum totum. </
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Theorema
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61.
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Mobile deſcendens ex O in E tranſit per tot plana inclinata diuerſa, quot
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ſunt puncta in tota EO vt conſtat, vel potiùs quot poſſunt duci Tangentes di
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uerſæ in toto arcu PE
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; quippe Tangens puncti P eſſet parallela IG, idem
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dico de omnibus aliis punctis arcus PE. </
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Theorema
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62.
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Motus funependuli in quolibet puncto arcus, per quem deſcendit, eſt ad mo
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tum in perpendiculari, vt ſinus reſidui arcus ad ſemidiametrum
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; </
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<
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">v.g. ſit fune
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pendulum AD in perpendiculari, quod vibrari poſſit circa punctum im
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mobile A, eleuetur in A
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, ducatur Tangens
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V motus funependiculi in
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puncto
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ſcilicet initio, idem eſt, qui eſſet in plano inclinato
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V vt patet,
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atqui motus in inclinato plano
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V eſt ad motum in
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vt
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V.
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ad
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V, ſed
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V eſt ad
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V vt
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ad A
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, ſunt enim triangula proportionalia;
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igitur motus initio ſcilicet in puncto arcus putà B eſt ad motum in per
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pendiculari etiam initio conſideratum, vt ſinus rectus reſidui arcus, putà
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D ad ſemidiametrum, vel ſinum totum, id eſt
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ad A
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, idem dico de
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omnibus aliis punctis. </
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Theorema
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63.
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Hinc proportio accelerationis motus in deſcenſu funependuli ſeu incremen
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ti in ſingulis punctis additi eſt in proportione huiuſmodi ſinuum minorum ſem
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per & minorum
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; v.g. motus in puncto B eſt vt BA ſemidiameter in
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vt
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<
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in
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vt
<
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, id eſt licèt maior ſit motus in
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quàm in B, cum ſcilicet
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deſcendit ex B in
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, vt illa portio crementi quæ in ipſo puncto
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addi
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tur eſt ad primam in B vt
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ad BA. </
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Theorema
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64.
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Hinc velocitas acquiſita in arcu BT eſt ad acquiſitam in arcu B
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, vt
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omnes ſinus eiuſdem arcus B
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ad omnes ſinus arcus B
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, & hæc ad acquiſi
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tum in toto quadrante BD, vt hi ad omnes ſinus quadrantis
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; </
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<
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comparari acquiſita tantùm in arcu BT, cum acquiſita in arcu
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vel
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D, quod probatur; quia motus, qui reſpondet ſingulis punctis arcus initio
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eſt in proportione ſinuum ſeu tranſuerſarum BA,
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, &c. </
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<
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">igitur ſi
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à ſingulis punctis arcus quadrantis in rectam lineam compoſiti duce
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rentur; </
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>
<
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in vno puncto eſt ad acquiſitam in alio puncto vt linea tranſuerſa ad </
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