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

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1
conſtringatur anguſteturque, & proinde incumbens
aqua velociori motu, & ideò impetu, & vi maiori
fluere cogatur per anguſtias C, quàm per amplum̨
alueum BFQ quare oportet vt vehementiùs, & ma­
iori impetu, & vi pars olei versùs C deorsùm com­
primatur, contundaturque quàm reliquæ partes olei
propinquiores vertici eius B, è contra aqua ſubiecta
CKIG reflectitur ſursùm, impellit, atque contundit
infimam baſim olei GC ea vi, & impetu quo collate­
ralis aqua FCPQ exceſſu ſuæ grauitatis ſuperat ſpe­
cificam olei ponderoſitatem.
Patet ergo quod à dua­
bus viribus contrarijs, veluti prælo, comprimitur oleum
BCG ſupernè ab impetu aquæ obliquè deſcenden­
tis per BC, & infernè à vi aquæ reflexæ oleum ſursum
impellentis, cùmque vis, & compreſſio, quæ ſupernè
infertur, inæqualis ſit, vehementiori, & validiori vi
facta propè terminum C, & debiliori, verſus verticem
B, impulſus verò ſubiectæ aquæ IKCG licèt vnifor­
mis ſit vbique, nihilominùs propter minorem deſcen­
dentis
aquæ obſiſtentiam in B, quàm versùs C ſit
vt vehementiùs oleum impellatur contundaturque à
ſubiecta aqua reflexa versùs axem IG vbi niſum con­
trarium
debiliorem offendit quàm versùs latera A, &
C, & propterea ſuperficies ſubiecta olei AGC exca­
uata erit ad modum ſcutellæ, & hoc quidem neceſ­
ſariò efficietur non à vi intrinſeca, & naturali leuita­
tis ipſius olei, ſed à ſuppoſita energia grauitatis
fluidi ambientis, quod fuerat demonſtrandum.

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