Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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qualiter CI; </
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<
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<
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">ſit E centrum
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grauitatis ſectoris BCHI, ſitque vt ſectio FCHI, ad triangulum BEI,
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ita DE ad EG, vel vt ſectio ad ſectorem, ita DE ad DG; G eſt centrum
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grauitatis ſectionis, per p.7. </
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<
s
id
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">His poſitis voluatur ſector AKHM, circa axem CB, perinde ſe ha
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bet circumactus, atque ſi ſingulis partibus incumberent rectæ, quæ eſſent
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vt motus earumdem pretium, vt conſtat ex dictis; </
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<
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id
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">igitur ſit ſector AEF
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D, æqualis priori, perinde ſe habet, atque ſolidum AEFDCB, quod
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ſcilicet conſtat ex pyramide AEDCB, & ſegmento cylindri EFDCB; </
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pyramidis centrum grauitatis ſit I, ita vt IG ſit 1/4 GA, ſit M centrum
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grauitatis ſegmenti ſolidi, ſeu potiùs ſit terminus perpendicularis deor
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ſum, quæ ducatur per centrum grauitatis eiuſdem ſolidi; </
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<
s
id
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">diuidatur IM
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in N, ita vt IN ſit ad NM, vt ſegmentum cylindri GEFDCB, ad
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pyramidem AEDCB; certè N eſt centrum grauitatis ſolidi AEFDCHB,
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per p.7. igitur N eſt centrum percuſſionis ſectoris circumacti. </
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Theorema
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14.
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Si
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ſector AKHM voluatur circa Tangentem NHL, determinari
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poteſt centrum percuſſionis eodem modo
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; </
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<
s
id
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">nam aſſumi poteſt cuneus, vt ſuprà,
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cuius baſis ſit ſegmentum cylindri; </
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<
s
id
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">tùm pyramis cum eadem baſi; </
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<
s
id
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">tùm in
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ueniri centrum grauitatis vtriuſque; </
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<
s
id
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N29B5D
">tùm detracta pyramide ex cuneo,
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haberi reſiduum ſolidum, cuius centrum grauitatis inuenietur, iuxta prę
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dictam praxim; quippe hoc erit centrum percuſſionis quæſitum. </
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Theorema
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15.
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Si voluatur
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triangulum FBH circa FM, in quam cadit HF perpen
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diculariter: </
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<
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1/4
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FI, ducaturque NP parallela HB, ſe
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cans FC in O, dico punctum O eſſe centrum percuſſionis
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; quod eodem modo
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probatur quo ſuprà Th.11. </
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Theorema
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16.
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Si voluatur quodlibet triangulum circa angulum rectum, determinari pe
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test centrum percuſſionis
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; </
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<
s
id
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">ſit enim triangulum ABC; </
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<
s
id
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">ducatur quælibet
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linea Tangens angulum, v.g. DBE, circa quam voluatur triangulum, du
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cantur AE, CD perpendiculares AD; </
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<
s
id
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">aliæ duæ ipſis æquales AFCG,
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perpendicularis in AC; </
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<
s
id
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">tùm FG connectantur; </
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<
s
id
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N29BC8
">eleueturque Trapezus
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AG, donec AF, CG incubent perpendiculariter plano ABC; </
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<
s
id
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">denique
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à B ducantur rectæ ad omnia puncta Trapezi erecti, habebitur pyramis,
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cuius centrum grauitatis, dabit centrum percuſſionis quæſitum, per Th.
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11. quod vt fiat, inueniatur centrum grauitatis Trapezi AG, modo di
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cto, ducta ſcilicet FC, aſſumptoque I centro grauitatis trianguli FGC
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& L centro grauitatis trianguli FAC; </
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<
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id
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">ſi enim ducatur LI, ſitque LI
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ad LP, vt Trapezium AG, ad triangulum FGC; </
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<
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">certè P eſt centrum
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grauitatis Trapezij per p.7. tùm ex P erecto ducatur recta ad B, hæc erit
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axis pyramidis; </
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<
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<
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">tùm BO habebi-</
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