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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PROP. LXVIII.
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Flamma rarior fumo minus ſpatium occupat ob
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eius velocitatem, redditurque poſtea inuiſibilis noua
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de cauſa, & tactui languida ob eius
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diſperſionem.
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<
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">OBſeruatur profectò titionem fumi copiam
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tem</
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euomere, ſed ſi denuò eius flamma reui
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uiſcat, hęc mirabili velocitate fumi illius vaſtam mo
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lem abſumere videtur, eumque in exiguum ſpatium
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flammæ concludere, cùm reuera non ſit reſtrictio,
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flamma enim maiorem raritatem habet, quàm fumus,
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pendet ergo hoc ab ineffabili velocitate partium̨
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flammæ. </
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<
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id
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">aliundè enim notum eſt per reſtrictum flu
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minis canalem molem ampliſſimam aquæ totius flu
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minis pertranſire, non quia in exiguo, & reſtricto illo
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ſpatio canalis condenſetur tota aqua fluuij, ſed quia
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velociſſimo motu per eum excurrit; cùm è contrà in
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parte ampla fluuij aqua lentiſſimo curſu progredia
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tur, ſic paritèr in fumo particulæ eius lento, & tardo
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gradu excurrentes amplum, & grande ſpatium oc
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cupabant, in flamma verò
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particulæ veluti per
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ſtrictiſſimum canalem mirabili, & ineffabili veloci
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tate currunt, & ſic poſſunt exiguum ſpatium comple
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re. </
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ditur, neque viſibilis redditur? </
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<
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,
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quòd reuerà flamma producitur vltra eius verticem
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per notabile ſpatium, & hoc quidem percipitur non </
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