Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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1
libra imaginaria HI, quia hæc duo corpora motibus
contrarijs agitantur ſuſpendunturque ab eadem li
bra horizontali: nec actionem eorumdem corporum
impediunt, vel adiuuant ſupremæ, vel infimæ aquæ
partes; quando quidem aqua AB,

12[Figure 12]
æquilibratur collaterali AG cùm̨
ſint homogeneæ & æquè altæ, non
ſecùs infimæ aquæ partes CD & F
E inter ſe æquilibrantur; quare ac
tioni compreſſiuæ mercurij CB, tan
tummodo contraponitur pondus
aquæ FG in eodem ſitu horizontali
conſtitutæ. fiat iam vt pondus mer
curij CB ad grauitatem aquæ FG
ita reciprocè diſtantia IM ad MH,
quare punctum M erit centrum gra
uitatis duorum corporum BC, & GF, cùmque librą
imaginaria HI fulciatur in puncto L rectæ LK per
pendiculariter horizonti eductæ ex infimo ſitu fiſtu
læ, vbi bifariam libra, & magnitudines fluidæ ſecan
tur, igitur conſtituitur fune-pendulum LM, & proin
dè, iuxtà leges mechanices, libra flectetur deſcenden
do corpus BC, & aſcendendo aquam FG, & hoc per
ficitur propterea quòd centrum communis grauita
tis M neceſſariò labitur deorſum iuxta penduli na
turam. ſed prædictus motus centri grauitatis M non
eſt circularis, ſed eſt directus ad horizontem perpen
dicularis, per lineam MQ non ſecùs ac in trochlea con
tingit vt dictum eſt; huius operationis verò progreſ-

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