Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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maiorem leuitatem in aëre communi quàm
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vt obſiſtat quatuor granorum grauitati? </
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>Ignis
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enim naturam in motum maximè pronam
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ſi attentiùs conſideremus, nihilquè igne le
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uius nobis innotuiſſe animaduertamus, cum
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in tertiâ potiſsimum & ſupremâ aëris regio
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ne ignitæ impreſsiones Meteorologicæ ac
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cendantur, nemo facilè negauerit ignis leui
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tatem ſaltem tantam eſſe, quæ vincat me
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dullæ ſambuceæ grauitatem, datâ molis æ
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qualitate; nihil quippe medullâ ſambuceâ
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leuius, hoc eſt minùs graue, potui adhuc
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deprehendere. </
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<
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>Medullam enim ſambuci
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vtcunque viridis cylindricam expendi, cuius
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altitudo erat digitorum 2 2/3 & baſis diameter
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digiti 1/4, fuitque pondus gran. 3: æqualis au
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tem cylindri cerei pondus fuit gran. 72. At
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qui ſi ignis tanta ſit leuitas ſurſum, quantą
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eſt medullæ ſambuceæ grauitas deorſum̨,
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multò maior eſt ignis leuitas quàm aeris igni
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ti in Æolipilâ. </
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<
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>Nam quia baſis diameter
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eſt digiti 1/4, & altitudo dig. </
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>2 2/3, ſi diametri
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quadratum 1/16 ducatur in altitudinem
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/3, na
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betur parallelepipedum digiti ſolidi 1/6: hoc
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autem parallelepipedum eſt ad cylindrum
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in Ratione baſium, quadratum autem dia
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metri ad circulum habet maiorem rationem </
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