Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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tam, & compoſita ex reſidua, & addita ſit omnium poſſibilium minima;
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ſed his omiſſis & ſuppoſitis, eo motu hic cylindrus, atque adeò cœteris
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paribus, quodlibet corpus movetur, ſive ab intrinſeco, ſive ab extrin
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ſeco, quo faciliùs moveri poteſt; idem obſervamus in ſagittis aliiſque
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corporibus oblongis, ſi vel aliquando ſponte ſua cadunt, vel projiciun
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tur; ſed luculentum exemplum omittere non poſſum, globi ſcilicet per
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planum declive deſcendentis, cùm enim duobus modis deorſum ferri
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poſſit. </
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<
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id
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">Primò vno dumtaxat motu centri, quo ſingulæ partes per lineas
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plano inclinato parallelas eant. </
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<
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id
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">Secundo motu rotationis, mixto ſcilicet
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ex motibus centri & orbis; hoc ſecundo modo movetur, non verò pri
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mo, quem multus partium affrictus maximoperè retardaret. </
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Auguſtin.
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Hæc concedere non poſſum; ideò enim movetur hoc motu,
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quia cùm centrum gravitatis globi ſit extra perpendiculum, quid mirum, ſi
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eò inclinet, vnde motus orbis neceſſariò ſequitur; vt facilè etiam ſine
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figura quivis intelligat? </
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Antim.
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"> Nonnihil tamen figuræ adhibeo, vt maximam difficultatem,
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quam ego quidem ſentio, in eo, quod dicis, mihi excutias. </
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<
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">Sit planum inclinatum DH, & in eo
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globus gravis, tangens planum in D, per
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pendicularis AF, à centro globi ducta;
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ſintque aliæ duæ lineæ BAG, CI, plano
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parallelæ, deſcendit globus A, vt dixi,
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non quidem primo modo, ita vt punctum
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C ſequatur lineam CI, & punctum D
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lineam DH. </
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<
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">Sed per rotationem, vt
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aiunt, ita vt circa centrum A, aliæ par
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tes moveantur, quia, inquis, centrum
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globi A eſt extra perpendiculum; de quo amabò perpendiculo intelligis
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an de BD ducto à puncto contactus, an verò de AF. </
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Auguſtin.
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<
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id
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"> Vtrumque intelligo; vt enim globus ſuſtineatur in plano
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DH, perpendiculum, quod ducitur a puncto contactus B, per centrum
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A ite deberet; vnde certè planum eſſet horizonti parallelum; quando
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verò vnum perpendiculum cum alio non concurrit, vt in hoc caſu,
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tunc planum eſt inclinatum; igitur cùm centrum A per lineam perpendi
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cularem AE non ſuſtineatur à plano, vlteriùs enim ad F pertingit, deſcen
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dat neceſſe eſt, cùm deſcendere poſſit; in aliis omnibus corporibus, per
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fectam analogiam habes. </
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<
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">Sit enim planum horizontale CN, & in eo
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rectangulum CB, cuius centrum gravitatis F, ita
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inclinetur rectangulum CB, donec perveniat ad
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ſitum DI, exiſtente centro gravitatis in H, ac
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proinde cùm perpendiculam HL cadat extrà
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punctum contactus D, deorſum tendit, & to
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tum rectangulum ruit. </
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">Idem prorsùs de globo
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dicendum eſt. </
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Antim.
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<
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"> Crede mihi, Auguſtine, multi ſæpè
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ac ſæpiùs paralogiſmis, & falſis præoccupatio-</
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