Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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131
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des, & cubi. </
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<
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">Prima eſt, quia minima ſui parte planum con
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tingunt hoc eſt minori, quam cuiuſlibet alterius figuræ cor
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pora, reſpectu, verbi gratia ſphæræ, quæ planum tangit in
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puncto. </
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<
s
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N13EF0
">Secunda verò eſt, quia hoc pacto non offendunt, aut
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impingunt niſi ſcilicet rarius, ac difficilius; A terra enim ſe
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motus eſt angulus, inquit Ariſtoteles, nimirum angulum
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contingentiæ, ſeu contactus, quia poſt punctum contingen
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tiæ, totum latus curuilineum ipſorum corporum orbicula
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rium, quod cum plano conſtituit huiuſmodi angulum, è ter
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ra eleuatur; ac propterea minus impingunt in offendicula,
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quàm alia corpora, quorum latera
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nõ
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ſtatim poſt minimum
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contactum eleuantur, ſed ipſi plano, ſeu terræ adhærent.
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</
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<
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">Tertia cauſa eſt, nam huiuſmodi corpora cuicunque ob
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uient offendiculo, illud pariter nonniſi ſecundum puſillam
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ſui partem attingunt, eadem ratione, qua planum, ſeu ſolum
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ſuper quod ipſa mouentur, ſecus, ac rectilineam figuram ha
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bentia, quæ ſemper ſua rectitudine ſecundum magnam, vel
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ſaltem maiorem partem contingunt. </
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<
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">Ad hæc quartam cauſam addit Ariſtoteles. </
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<
s
id
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N13F1B
">Nam (inquit)
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quò nutat pondus, eo motor mouet. </
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>
<
s
id
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N13F20
">Hoc eſt, quia motor
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dum huiuſmodi corpora rotunda, vel ſphærica ſecundum
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abſidem mouet, eo profectò impellit, quo ſtatim ipſorum
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pondus propendit ſiue inclinat. </
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<
s
id
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N13F29
">Etenim ſi conſtituatur ſu
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per planum AB horizonti
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paralellum erecta aliqua
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rota, vt CDEF tanquam
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circulus, eius diameter à
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contactu plani vbi C per
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pendiculariter ad angulos
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rectos per centrum ſupra
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traſcendens ad D, totam
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rotam eiuſque pondus in
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duas partes æquales diſtri
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buet, nempe in DFC, &
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DEC.
<
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Eritq.
">Eritque</
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ipſa rota in </
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