Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ua reperit, quòd grauitas molis aeris, quæ æqualis
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ſit cubo aqueo vnius libræ granum vnum pendet. </
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Merſennus in Phęnomenis pneumaticis ope ignis
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dem</
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experientiam fecit, ſumpſit æolo pilam æream,
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eamque vehementiſſimo igne calefecit, vt prorsùs
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candeſceret, & ſic in bilance perſectiſſima, quæ à ſe
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migraro ſlectebatur, examinauit pondus eiuſdem̨
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ęolo pilæ
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, eamque reperit
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4. drach.
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">6. & gran. 15. poſtea refrigerata æolo pila eius pon
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dus præcedentem ſuperauit gran. 4. & hinc elicit ae
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rem incluſum in æolo pila grana 4. ponderaſſe, porrò
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pondus aeris illius ad æqualem aquæ molem ait re
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periſſe in proportione 1. ad 1356. </
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4. de cęlo.
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cap. 4.</
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Cap. 5. de ae
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ris grauitate
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æquilibrio,
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ſtructura, &
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vi elaterią
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eius.</
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Prop. 29.</
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<
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">Sed prædicta experientia multis nominibus infi
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delis eſt, primò quia corpora vehementer excalefacta
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in bilance ſuſpenſa non oſtendunt veram grauitatem
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eorum, ſed diminutam, quia vt ſuperiùs oſtenſum̨
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eſt, ignis diffuſus ab æolo pila candente valdè rare
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facit aerem prædictam æolo pilam ambientem, cum
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que aer ambiens fimul cum pila vnum corpus graue
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componat intra denſiorem aerem ſuſpenſum, fit vt
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aggregatum prædictum minùs graue ſpecie ſit,
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prius, & proinde imminuitur grauitas æreæ æolo pi
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læ, non ſolùm ob deſectum aeris incluſi, ſed etiam ob
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eius ſeruentiſſimam caliditatem. </
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c 4 prop. 61.</
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<
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pliatus expanſuſque non poteſt dici verè rarefactus,
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quia nimirùm copia ignis vehementiſſimè agitati, &
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circumuoluti intra æolo pilæ cauitatem diſgregat, ac </
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