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

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1
molis ſupra baſim HD inſiſteret procul dubio ad ma­
iorem ſublimitatem eleuaretur prædictum fluidum̨
minùs graue ſpecie, quàm aqua AH, cuius abſolutum
pondus æquale eſſet ponderi eiuſdem aquæ commu­
nis AH, quare ab eleuatiori loco fluidum prædictum
deorsùm excurrendo eleuaret lignum depreſſum BD
præcisè vt in ſiphone ſuperiùs expoſito contingeret.
Cap. 2. dę
momentis
grauium in
fluido inna­
tantium.
Ex hac theoria facili negotio reſolui ac demonſtra­
ri
poſſunt omnes propoſitiones, quæ ab Archimedę
in primo de infidentibus humido demonſtrantur.
PROP. XII.
In aſcenſu, vel deſcenſu ſolidi in fluide neque libra linearis
eſt, neque habet centrum grauitatis in vno puncto
ſed libra eſſe ſolet ſuperficialis, cuius fulci­
mentum eſt linea circa centrum figuræ,
& grauitas communis exercetur
quoque in linea aliqua.
SOlummodò indicabo non ſemper vſurpari in præ­
dicta mechanica operatione punctum, quod com­
mune
centrum grauitatis vocari vulgò ſolet; propte­
rea quòd libra compoſita ex ſolido & fluido ambien­
te non ſemper linearis eſt, ſed ſuperficiem aliquando
componit, in qua nedum fulcimentum, ſed etiam lo­
cus vbi exercetur communis grauitas linea eſſe ſolet
aliquando recta, aliquando curua, & multoties com­
poſita ex pluribus rectis.
ſi enim in medio aquæ im­
mergatur directè & perpendiculariter ad horizontem

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