Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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AB, & ſic denuò quouſque repetitis vibrationibus
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ſenſim languendo, tandèm quieſcat in ſitu naturali
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EF. </
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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<
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">Pari modo ſumpto
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dulo</
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AB quod moueri poſſit
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circa ſuum centrum firmum A,
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remota pila plumbea. </
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<
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ſuo naturali, ſeu perpendicu
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lari ad horizontem, perducta
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que ad ſitum eleuatum C, illa planè vt grauis excur
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ret deſcendendo arcum CB, & vniuerſus is motus na
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turalis erit, vtpotè dependens ab impetu grauitatis
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intrinſeco, non tamen in infimo ſitu B pila perſiſtet
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poſtquam ibidem perducta eſt, ſed vlteriùs excur
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ret ferè æquali ſpatio priori vltrà perpendiculum vſ
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que ad ſitum D, aſcendendo nimirùm ab infimo ſitu
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B per integrum arcum BD, & quia motus ille qui gi
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gnitur à principio intrinſeco, & naturali non poteſt
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eſſe non naturalis, cùmque aſcenſus pilæ vltra cen
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trum terræ, & deſcenſus cylindri EF infra aquæ li
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bellam poſt caſum, & aſcenſus pilæ plumbeæ per ar
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cum BD pendeat, creeturque ab illa naturali virtu
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te grauitatis nempè eiuſdem corporis deſcendentis
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quatenùs deſcendit: nulla enim alia cauſa extrinſe
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ca ſuperueniens excogitari poteſt, quæ violentiam̨
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inſerat, & ſursùm impellat prædictum graue, quàm
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impetus acquiſitus, & conceptus in ipſo caſu natura
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litèr facto productoque à principio intrinſeco graui
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tatis eius, qui procùl dubio impetus à naturali prin-</
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