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

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ſubiecta CID è ſuo loco expellatur, & lateralitèr fluat
verſus P, circumferaturque ſurſum vſque ad locum̨
relictum à prędicto priſmate lapideo in E. ſunt igitur
duæ partes MT, & MS veluti duo canales laterales
ſiphonis, qui tamen ſeſe contingunt in communi la-
tere MV; prætereà duæ portiones aquæ ſupremæ XA,
& MG cùm ſint homogeneæ, æquè graues ſpecie, &
æque altæ, ſe mutuò æquilibrantur, pariterque duæ
portiones aqueæ ſubiectæ CV, & DS pariter æquili-
brantur, vnde patet quòd tantummodo comparari
debent inter ſe duo corpora collateralia ſaxum nimi-
rum BD, & aqua AH, quæ ab eiſdem planis horizon-
talibus BG, & HC comprehenduntur, & hæc ſimiliter
fulciuntur ſuſtentanturque à plano aquæ ſubiectæ H
C non firmo, & impermeabili, ſed facilè à ſuo loco
amouibili & cedenti.
inſiſtunt igitur prædicta duo cor-
pora BD, & AH non ſecùs ſuſpenſa ac ſi ſuper libram
HC inniterentur; huius verò centrum mobile eſſet
punctum intermedium D, vbi nimirum libra HC bi-
fariàm ſecatur, & ſi à centro grauitatis O ſaxi BD ad
centrum P grauitatis aquæ AH recta linea coniunga-
tur
, eaque ſecetur in Y reciprocè ſecundùm propor-
tionem grauitatum eorumdem corporum, patet Y eſ-
ſe centrum grauitatis communis ſaxi BD, & aquæ A
H, cùmque libra PO ſecetur bifariàm à plano MV in
Q iam conſurget fune-pendulum QY horizontaliter
excenſum versùs O ob exceſſum grauitatis ſaxi ſupra
aquæ pondus ſpecificum, igitur neceſsè eſt vt totą
libra flectatur deorsum, & ſic ſaxum BD deſcendet.
Quia

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