Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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ſpoſitionem materiæ, vt ſi grauior, aut leuior; denſior, aut
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rarior; fortior, aut imbecillior in ſe ſit. </
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<
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N14E90
">Nam frequenter ex
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ijs pendet, vt nonnulla corpora plus facilitatis ad ſe incli
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nandum acquirant ex maiori longitudine, quàm difficulta
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tis ex maiori craſſitie: Alia verò contra. </
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<
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id
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N14E99
">Deinde ſpectan
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dam eſſe ipſam eandem proportionem craſſitiei ad longitu
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dinem conſiderando quænam illa ſit. </
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<
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id
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N14EA0
">Etenim quamuis con
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ſtituatur eadem proportio, in vno atque in altero, non ta
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men omnis proportio eundem effectum in illis producit.
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</
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<
s
id
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">Eadem namque eſt proportio craſſitiei vnius digiti ad lon
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gitudinem vnius cubiti atque quinquaginta digitorum ad
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quinquaginta cubitorum: & tamen virga ferrea, aut lignea
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ſi digitalis craſſitiei fuerit
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abbr
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longitudinisq.
">longitudinisque</
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vnius cubiti, non
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tam facilè ſuo pondere flectetur, ac lignum, vel ferrum
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quinquaginta digitorum craſsitiei,
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abbr
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totidemq.
">totidemque</
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cubitorum
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longitudinis. </
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<
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">Quod ſi vnius palmæ fuerit craſsitudo, longi
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tudo verò vnius cubiti nihil difficilius videretur inflecti,
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quam ſi duarum palmarum conſtitueretur craſsitudo in
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longitudine bicubita. </
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<
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id
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N14EC8
">Ad hæc proportio, quæ auget facili
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tatem, aut difficultatem inflexionis in vna ſpecie ligni, non
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auget in alia ſicut non æquè in ligno, ac ferro plumbo, aut
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calibe. </
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<
s
id
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N14ED1
">Quare nihil determinari poteſt quo ad hoc niſi per
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ſpecta, vt diximus diſpoſitione materiæ,
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abbr
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variaq.
">variaque</
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proportio
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ne, quæ diuerſimodè iuxta maiorem, aut minorem corpo
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rum magnitudinem operatur. </
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<
s
id
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">Denique vt dictum eſt de eleuatione, ac ſuſpenſione li
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gni, vel alterius corporis oblongi ſumpti ab altera tantum
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extremitate, vt exemplificauimus in ſariſſa, idem dicendum
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eſt de eleuatione, ac ſuſpenſione, quæ fit, vel ex ambabus
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extremitatibus; vel ex medio inter illas: Nam ſi vtrinque ab
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extremitatibus ſuſpendatur aliquod lignum ad paralellum
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horizonti, duo quidem in illo vectes fient in ipſis extremita
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tibus fulti,
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abbr
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ponderaq
">ponderaque</
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>
in communi puncto intermedio gra
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uitabunt tanquam in remotiſsimo ſitu ab vtriuſque fultura.
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</
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<
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id
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">Quapropter ibidem fiet vtriuſque vectis, ſeu totius ligni in
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flexio, ſuppoſita vt diximus flexibilitate materiæ,
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ipſaq.
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ce-</
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