Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ciliùs eleuari, igitur omninò neceſsè eſſet vt fumus
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in prædicto vacuo ſpatio aſcenderet ſursùm, veluti
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eius natura exigit, & è contrà eſſet impoſſibile vt
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deorsùm deprimeretur, & caderet, vt virgulæ deci
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dentes aquæ fontium flectuntur deorsùm; quia verò
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hoc experientiæ repugnat non poterit dici, quòd fu
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mus ſit leuis, ſed è contrà grauis erit. </
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">Cùm verò iņ
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aere idem fumus ſursùm aſcendat,
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eſt quòd
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ab aere ambiente grauiori in ſpecie, quàm ſit fumus
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iuxtà leges mechanicas libræ aer
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per extru
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ſionem ſursùm fumum minùs grauem expellit. </
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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. LXIII.
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Figuram pyramidalem flammæ lucernæ non ſuadere eam à
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vi leuitatis ſursùm impelli.
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<
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">VErùm, quod ad formam pyramidalem flammæ
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lucernæ pertinet, non videtur, quòd eius figu
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ra conica neceſſariò perſuadeat, & conuincat flam
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mam ſursùm ſponte ſua, & propria virtute leuitatis
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aſcendere, nam ſiue per extruſionem ambientis flui
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di violenter, ſiuè ſponte à vi leuitatis ſursùm moue
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ri ſupponamus, retinere æquè benè poſſet eamdem̨
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conicam
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, vt inferiùs oſtendemus. </
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vera cauſa figuræ pyramidalis flammæ lucernæ eſſet
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eius leuitas poſitiua, deberet eadem leuitas poſitiua
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eumdem effectum producere in reliquis omnibus
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corporibus fluidis paritèr ab ipſa impulſis, ſi tamen
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reliqua ſint paria, ſcilicèt fumus non ſecùs ac flam-</
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