Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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AB, & ſic denuò quouſque repetitis vibrationibus
ſenſim languendo, tandèm quieſcat in ſitu naturali
EF.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
39[Figure 39]
Pari modo ſumpto fune-pen­
dulo AB quod moueri poſſit
circa ſuum centrum firmum A,
remota pila plumbea. B à ſitu
ſuo naturali, ſeu perpendicu­
lari ad horizontem, perducta­
que ad ſitum eleuatum C, illa planè vt grauis excur­
ret deſcendendo arcum CB, & vniuerſus is motus na­
turalis erit, vtpotè dependens ab impetu grauitatis
intrinſeco, non tamen in infimo ſitu B pila perſiſtet
poſtquam ibidem perducta eſt, ſed vlteriùs excur­
ret ferè æquali ſpatio priori vltrà perpendiculum vſ­
que ad ſitum D, aſcendendo nimirùm ab infimo ſitu
B per integrum arcum BD, & quia motus ille qui gi­
gnitur à principio intrinſeco, & naturali non poteſt
eſſe non naturalis, cùmque aſcenſus pilæ vltra cen­
trum terræ, & deſcenſus cylindri EF infra aquæ li­
bellam poſt caſum, & aſcenſus pilæ plumbeæ per ar­
cum BD pendeat, creeturque ab illa naturali virtu­
te grauitatis nempè eiuſdem corporis deſcendentis
quatenùs deſcendit: nulla enim alia cauſa extrinſe­
ca ſuperueniens excogitari poteſt, quæ violentiam̨
inſerat, & ſursùm impellat prædictum graue, quàm
impetus acquiſitus, & conceptus in ipſo caſu natura­
litèr facto productoque à principio intrinſeco graui­
tatis eius, qui procùl dubio impetus à naturali prin-

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