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. XLII.
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Et primò oſtendemus, quòd quodlibet corpus à principio in
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trinſeco, & naturali ſponte translatum faciliùs, &
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celeriùs mouebitur in fluido rariori, & tenuio
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ri, quàm in medio fluido craſſo, &
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tenaciori.
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">SInt duo vaſa GHIK, alterum KILM,
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aqua
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repleatur, ſecundum verò hydrargyro, immer
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gatur verò eadem pila lignea A in vtroque fluido, in
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telliganturque duæ moles ſpatiales ex prædictis flui
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dis B, & C, quæ æquales ſint ipſi A, eique
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bant</
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, patet ergò quòd mercurij moles C grauior re
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ſiſtentior, denſior, atque compactior eſt, quàm ſit
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moles aquę B. præterea pila lignea
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A nullo pacto aſcendere ſursùm po
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teſt, niſi aquam B, ab eius loco ex
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pellat vt ei locum cedat, atque mo
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les ipſius ligni A
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ad oc
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cupandum ſpatium ei æquale B, &
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hoc ſemper contingit, vbique enim
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in
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cogitur continuato niſu
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ſursùm impellere incumbentem a
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quæ molem ei æqualem, tenacita
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temque eius penetrare, ponatur iam gradus natura
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lis impetus leuitatis ipſius ligni eſſe D, quia verò cor
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pus motiuum A impetu D affectum impellit corpus
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B fluidum, quod in quiete conſtitutum ſua naturali </
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