Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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tudinem S, niſi grauitas eius imminuatur; auferri igi
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tur debent aliqua grana, ſeù anuli ænei è collo fiſtulæ
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AM, vt machina ad æquilibrium
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aqua redigatur,
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mergaturque denuò
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ad ſitum S; quot igitur gra
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na tolluntur à fiſtulæ collo A, tot præcisè menſura
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bunt pondus aeris ABL intra fiſtulam incluſi. </
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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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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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">Multis modis poſtea indagari poteſt proportio
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ponderis aeris ad aquam, ſed omnium facillimus, &
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ſimplex erit ſi in aere perfectiſſima bilance pondere
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tur moles aquæ æqualis ſpatio ABL, & hic compa
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retur cum pondere iam inuento aeris eiuſdem molis
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ABL. </
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PROP. CXIX.
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Poſtea emisſis quam plurimis termostaticis à me inuentis
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afferam instrumentum quo pondus abſolutum aeris
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in diuerſis locis eleuatis, ac depresſis, & variè
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temperatis reperiri poteſt.
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<
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">FIant tres ampullæ, vel veſicæ vitreæ, vel æneæ,
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qualis eſt AB, habeantque collum
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CA
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æneum perfectiſſimè contornatum, hoc autem viſco
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ſa aliqua materia, ac tenaci vniatur ferrumineturque
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cum ſuprema ampullæ parte; habeat poſtea
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canalẽ
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,
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ſeu colli cauitatem turbinatam conicè, & perfectiſſi
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mè
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læuigatã
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, huic verò cauitati adaptari poſſit aliud
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operculum paritèr æneum, & turbinatum, & exqui
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ſitiſſimè læuigatum, vt nimirùm nulla rimula rema
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neat, & perfectiſſimè claudat orificium fiſtulæ C, vt </
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