Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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Cap. 4. poſi
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tiuam leui
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tatem noņ
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dari.</
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PROP. LXIX.
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Flammæ candelæ vertex acuminatur, quia magis accen
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ſus, & ideò velociùs aſcendit, quàm baſis eius.
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<
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">PRæterea
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ſupponẽdum
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eſt, flammam candelæ
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nõ
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habere conſiſtentiam homogeneam, & ſimila
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rem, pars enim infima flammulæ non eſt omninò ac
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cenſa, quod conſtat ex eius colore ſubliuido, quia
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nimirùm fumi oleoſi eructati ab elicnio, vel ligno
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nõ
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in inſtanti, ſed in
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tẽpore
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accendi debent, igitur veri
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ſimile eſt, quòd
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expan
abbr
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nõ
">non</
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omnes prędicti fumi ſubitò poſt e
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greſſum in ipſo contactu baſis flammæ ſimùl, & inte
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grè accendantur, & propterea rarefactio, & accen
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ſio continuatur dùm actu excurrunt illæ particulæ à
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baſi versùs verticem flammæ. </
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mulæ fumi non ſunt omninò, & integrè accenſi, non
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habebunt velociſſimum illum motum, cuius capax
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eſt flammæ puræ natura, igitur in ipſa flamma conci
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pi debet pars infima tardior, quàm ſuprema, & ver
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ticalis, ſed ſicuti in fluuio nulla alia de cauſa tantą
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copia aquæ in anguſtiſſimum ſpatium aluei reſtrin
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gitur coanguſtaturque, niſi quia velociſſimè excur
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rit, cùm è contrà in locis dilatatis, & amplis eadem
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aquæ fluminis moles amplius ſpatium aluei ob eius
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tarditatem occupet, ita in flamma lucernæ, quæ vt
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fluuius ignis excurrentis concipi poteſt, mirum
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nõ
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eſt, quòd in baſi propè elicnium ob tarditatem eius
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fluxus ampliorem ſitum occupet, quàm in eius ver-</
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