Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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391 - 420
421 - 450
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tice, vbi velociori curſu fugit. </
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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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<
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">Hinc colligitur, quòd ex figura pyramidali, & a
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cuminata flammæ lucernæ non euincitur eam à vi
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intrinſeca leuitatis ſursùm impelli. </
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claratum ſit, qua ratione abſque poſitiua leuitate ab
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expreſſione aeris grauioris ambientis ſursùm expel
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latur, pariterque oſtenſa eſt cauſa prædictæ eius fi
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guræ acuminatæ & in verticem deſinentis, quæ non
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pendet à leuitate propria, ſed ab expreſſione aeris
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maxima velocitate facta in eius acumine magis
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ſo</
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, & hoc confirmatur ex eo quòd multotiès flammæ
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candelarum non ſunt pyramidales, ſed rotundæ, aut
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oblongæ, & ouales, & hoc clarè conſpicitur quandò
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virga illa fumoſa, quæ eructatur ab infima lucerną
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nupèr extincta, denuò accenditur à contactu alte
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rius flammæ in notabili diſtantia ab inferiori cande
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la, & tunc fumus inflammatus per longitudinem to
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tius fumi ſubiecti deorsùm labitur vſque ad
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ſubiectæ lucernæ, conſpiciturque euidentèr figura
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illius fumi
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perfectè
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, imò
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primò lu
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cerna accenditur, eius flamma rotunda eſt, & poſtea
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verticem conicum acquirit. </
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<
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">in flammis verò camini
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non obſeruantur formæ pyramydales, ſed multipli
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citèr diuiſæ multotiès radios, ſeù linguas referunt,
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& aliquando rotundæ conſpiciuntur, & ſic eleuan
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tur per aliquod ſpatium. </
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