Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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49
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nibus abripi ſe ſinunt, quod in præſenti caſu, meo ſaltem iudicio, acci
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dit; vt enim in tua ſiſtamus figura; non negabis, opinor, centrum H
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minimè deſcenſurum, ſi fortè propiùs ad planum CN accedere non poſ
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ſet, cùm ex ipſis terminis idem ſit deſcendere, & propriùs ad planum DN
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accedere; At verò centrum A (
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in Figura perultima
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) propiùs ad planum in cli
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natum DH accedere non poteſt, à quo æquali ſemper diſtantiæ menſura
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diſtat, ſcilicet radio, vnus autem radius alteri æqualis eſt; hinc nunquam
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diſcedit à linea AG parallela Plano DH, & quodlibet perpendiculum ad
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planum terminatum à centro A ductum lineæ AF æquale eſt. </
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Chryſoc.
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<
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"> Proptereà globus deſcendit, quia eius centrum A non
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ſuſtinetur in puncto contactus, cùm ſuſtineri non poſſit niſi in perpen
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diculo AF. </
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Antim.
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"> Rectè, Proptereà globus deſcendit; ſed profectò non pro
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pterea globus volvitur, ſive enim volvatur deorſum, ſive deſcendat iux
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ta primum modum in ſitu, in quo eſt, centrum A per eandem lineam
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AG, deorſum tendit, nec vnquam ab ea diſcedit, aut diſcedere poteſt;
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cur igitur cum vtroque modo, per eandem lineam deſcendere poſſit, hoc
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ſecundo potiùs, quàm illo primo deſcendit? </
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<
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">quod enim dicis, Auguſti
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ne, centrum gravitatis A eſſe extra perpendiculum, ac proptereà deſ
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cendere, id totum verum eſt, & à me admittitur, vndè reverà deſcen
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dit; ſed per lineam AG, infrà quam deſcendere nequit; ſed cùm per eam
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vtroque modo ire poſſit, ac proinde deſcendere, cur, quæſo, vno
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potiùs quàm alio? </
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">Sed hoc alio exemplo fortè luculentiore clariſſimè
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oſtendo. </
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<
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">Sit planum inclinatum AB, ſit rectan
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gulum C in eo collocatum; certè ſi ſup
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ponatur vtrumque lævigatum, deſcen
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det rectangulum, per dictum planum,
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ibitque centrum gravitatis C per CP
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parallelam plano; nec enim aliter per ſe
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deſcendere poteſt, nec volvi circa angu
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lum D, quod fieri deberet, vt fueret;
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alioquin centrum C in revolutione aſcen
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deret, quod dici non poteſt; Sit enim
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CD perpendiculum, & CN horizontalis, haud dubie ſi C volvatur
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circa D, radio DC, tangens decta à puncto C, perpendicularis in
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CD, ibit ſuprà horizontalem CN, vt patet ad oculum: Dixi per ſe,
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nam per accidens, cùm à plani ſcabutie impediri poſſit, latus AD, ſu
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perior portio quæ libera eſt, impetus vi acquiſiti, prævalens, deor
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ſum circum volvitur circa angulum D ; ſed hoc per accidens fit. </
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<
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">Sit autem
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aliud rectangulam F in eodem plano inclinato, perpendiculum, FH, ho
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rizontalis FO; certè ſi ducatur tangens FK perpendicularis
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MF; ſi
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centrum F circa M radio MF volvatur, ibit infra FO, igitur non aſcen
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det ſed deſcendet. </
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<
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">itaque vt ad noſtrum globum redeat oratio cùm </
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<
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">nec
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circa punctum D volvi poſſit centrum A, (
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in Figura antepenuissima
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) niſi in-</
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