Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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31
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010/01/039.jpg
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molis ſupra baſim HD inſiſteret procul dubio ad ma
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iorem ſublimitatem eleuaretur prædictum fluidum̨
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minùs graue ſpecie, quàm aqua AH, cuius
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abſolutũ
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pondus æquale eſſet ponderi eiuſdem aquæ commu
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nis AH, quare ab eleuatiori loco fluidum prædictum
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deorsùm excurrendo eleuaret lignum depreſſum BD
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præcisè vt in ſiphone ſuperiùs expoſito contingeret. </
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Cap. 2. dę
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momentis
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grauium in
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fluido inna
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tantium.</
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<
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demõſtra-ri
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ri</
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poſſunt omnes propoſitiones, quæ ab Archimedę
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in primo de infidentibus humido demonſtrantur. </
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PROP. XII.
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In aſcenſu, vel deſcenſu ſolidi in fluide neque libra linearis
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eſt, neque habet centrum grauitatis in vno puncto
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ſed libra eſſe ſolet ſuperficialis, cuius fulci
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mentum eſt linea circa centrum figuræ,
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& grauitas communis exercetur
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quoque in linea aliqua.
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">SOlummodò indicabo
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nõ
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ſemper vſurpari in præ
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dicta mechanica operatione punctum, quod
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cõ-mune
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mune</
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centrum grauitatis vocari vulgò ſolet; propte
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rea quòd libra compoſita ex ſolido & fluido ambien
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te non ſemper linearis eſt, ſed ſuperficiem aliquando
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componit, in qua nedum fulcimentum, ſed etiam lo
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cus vbi exercetur communis grauitas linea eſſe ſolet
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aliquando recta, aliquando curua, & multoties com
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poſita ex pluribus rectis. </
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mergatur directè & perpendiculariter ad
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horizontẽ
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