Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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gutta aliqua mercurij ſubito ceſſat æquilibrium, &
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ideò maius pondus collateralis columnæ aereæ po
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teſt ſursùm intra fiſtulam impellere molem minus
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põ-derãtis
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derantis</
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mercurij incluſi; & licèt ab initio motus mer
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curij ſursùm ſit tardus, & debilis, tamen in progreſ
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ſu, & continuatione prædicti motus dum repetitis
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ictibus mercurius ab aeris pondere, & vi eius elaſti
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ca continenter impellitur, nouos gradus impetus, &
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velocitatis creat, qui impetus ſunt integri, &
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eiuſdẽ
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energiæ, non enim à vacuo intra fiſtulam incluſo de
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bilitari poſſunt, veluti debilitantur impetus
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corporũ
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per aerem excurrentium; prædicti verò gradus velo
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citatum ſimul coaceruati, tandem vim illam
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abbr
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ingentẽ
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componunt, quæ diffringere fundum vitreæ fiſtulæ
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poteſt; adde quod corpora grauiſſima; vt eſt hydrar
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gyrum validius fuſcipiunt retinentque vim impetus
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præconcepti, & hinc ſequitur percuſſio eius validiſ
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ſima in vitri fundum. </
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ſa experientia
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cõſirmari
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videtur; ſi enim fiſtula præ
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longa ſubtili, & gracili fundo clauſa, & mercurio ple
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na inuerſo ore infra mercurium in ſcutella
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ſtagnantẽ
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demerſa, & inclinato ſitu detineatur vt mercurius
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minus vno digito à ſupremo fundo diſtet, tunc ſu
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ſpenſa fiſtula aer adueniens fundum eius non diffrin
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git, at perpendiculari ſitu erecta fiſtula aer
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ſuccedẽs
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ingenti impetu
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diſtãtem
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à fundo mercurium propel
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lit vt eum diffringat, quia nimirum in prolixiori mo
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tu plures gradus impetus creari, & ſimul coaceruari
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poſſunt. </
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