Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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æquilibrio, quia non magis vna quam altera pars vtrinque
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à perpendiculo DC grauitare poteſt. </
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<
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">Quod ſi impulſus
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quamuis perexiguus in ipſam rotam à motore incutiatur,
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vt ex parte E verſus F, ſtatim pars vbi F nutabit ac pro
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pendet verſus B;
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abbr
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nutu, totam rotam ſecum trahet il
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luc. </
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<
s
id
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">Nam quælibet vis poteſt æquiponderantia ab æquili
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brio dimouere. </
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<
s
id
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N13F69
">Semel autem mota ipſa rota, niſi impe
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diatur deinceps nutabit ad partem verſus quàm primò fuit
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incitata; ideoque facilè vlterius atque vlterius mouebitur.
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</
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<
s
id
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">Quo enim vnumquodque vergit, mouetur ex facili, ſubdit
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ipſe Philoſophus, ſicut vice verſa difficulter in contrarium;
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vt fuſius conſtabit quæſt. </
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<
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">31. </
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</
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<
s
id
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">Atque hæc dicta intelliguntur de motu rotæ, aut ſphæræ
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ſuper planum horizonti paralellum. </
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>
<
s
id
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N13F82
">Nam ſuper planum
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quodlibet decliue, euidentius idem conſtabit. </
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<
s
id
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N13F87
">Siquidem
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demiſſa tantum rota, vel ſphæra ſuper illud, ſuo ſemper nu
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tu celerrimè deorſum rotando ſe conferet, imò in præceps
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quandoque decurret. </
s
>
<
s
id
="
N13F90
">Cum enim huiuſcemodi corpora per
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eam lineam maximè grauitent, quæ perpendiculariter ab
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eorum centro tendit ad centrum mundi, ſi ſuper decliue
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planum conſtituantur, nequibunt ſecundum eandem li
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neam fulciri, ac ſuſtineri ab ipſo plano. </
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>
<
s
id
="
N13F9B
">Nam punctum cir
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cumferentiæ per quod ipſa linea cadit ad centrum mundi,
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& cui totum ferè onus incumbit, ſemper manebit ſuſpen
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ſum ſupra planum ex parte inferiori ipſius, nec vnquam
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planum ipſum decliue continget. </
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>
<
s
id
="
N13FA6
">Circulus enim vel glo
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bus non tangit planum, niſi in puncto in quod eius diame
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ter incidit ad angulos rectos; quo ſanè pacto cadere non
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poteſt perpendicularis tendens ad mundi centrum in pla
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num, quod non eſt horizonti paralellum. </
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>
<
s
id
="
N13FB1
">Cumque præ
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dictum punctum, cui potiſſimum onus incumbit, ſuſtineri
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/>
non poſſit ab eo, quod non contingit; hinc fit, vt ſemper
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/>
verſus inferiores partes decliues propendat, ac nutet, de
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feratque propterea ipſa orbiculata corpora quouſque ab
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alio fulciatur. </
s
>
<
s
id
="
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">Vt perſpicuè apparebit in propoſita ſphæra </
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