Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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Cap. 6. non
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dari attracti
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onem.</
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PROP. CXXVIII.
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Corpora, quæ attrahi videntur, aut ſponte, aut à vi ex
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terna impelluntur.
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Cap. 25.</
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<
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">ET primò quoad ferrum, & magnetem pertinet,
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iam oſtendimus (lib. de vi percuſs.) ambo hæc
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corpora naturali vi ſpontaneo motu vnum versùs al
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terum moueri non ſecùs, ac grauia ſponte ad terram
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feruntur. </
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">In electricis verò iam ab alijs cauſa attra
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ctionis tradita eſt; conſtat enim experientia, quod
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niſi electrica corpora incaleſcant ope confricationis
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in aliquo panno factæ non attrahunt exiguas, & leues
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eiſque vicinas feſtucas, quæ proindè collocantur in
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quadam veluti atmoſphæra ex fumoſis, & calidis ex
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halationibus compoſita ambiente corpus
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electricũ
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,
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ex quo fit vt maſſa illa ex prædictis vaporibus, & fe
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ſtucis compoſita leuior ſit aere contiguo magis re
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moto, ideoque ab hoc maſſa illa fumoſa exprimitur,
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conſtringiturque vndique versùs
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corpus ele
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ctricum, &
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ſecum
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feſtucas. </
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">In tubis pneumaticis, & cteſibianis, nec non in cu
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cur bitulis medicis, dicendum, quòd ad eas fluida, &
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mollia corpora feruntur non ſpontaneo motu, ſed à vi
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externa impulſa, & hæc profectò non eſt alia quàm̨
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ſimplex grauitas oceani aerei
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terraqueum am
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bientis, à quo aqua, & corpora mollia ſubiecta
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cõ-primuntur
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primuntur</
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, exprimunturque, vt conſtat ex doctriną
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hydroſtatica ſuperiùs expoſita. </
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