Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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alligetur; & Orificium AB denuò veſica tegatur,
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colligeturque ſtrictè: tandèm ſublata veſica infima
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G concedatur egreſſus hydrargyro, vt nimirùm facta
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ſolita vacuitate aeris remaneat hydrargyrum
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ſum</
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vſque ad O, & altitudo GO erit proximè vnius
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cubiti, & quadrantis. </
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">His præparatis ſumatur lens
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aliqua cryſtallina KL, & directè Soli S exponatur in
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ea diſtantia, & ſitu in quo præcisè vertex coni radio
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ſi à radijs Solis refractis conuergentibus formati ad
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contactum pilæ bituminoſæ D pertingat. </
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fieri poteſt ope ſpeculi concaui vſtorij radios Solis
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reflectentis, tunc liqueſcere incipit pila D, & fumum
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emittit, in quo apparet mirabilis operatio, non enim
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fumus, veluti in aere aperto accidit, ſursùm aſcen
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dit, ſed incuruatur flectiturque deorsùm per DMN
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non ſecùs ac virgulæ illæ aquæ cadentis è fontibus,
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inflexas, & deorsùm tendentes lineas deſcribunt. </
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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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eſſe, atque ſursùm moueri ſponte ſua à naturali prin
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cipio impulſa,
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Peripatetica Schola docet,
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igitur neceſſario in ſpatio illo vacuo CEN, vel ſal
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tèm in quo aer non degit niſi valdè expanſus, & rare
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factus, fumus maiori vi ſursùm aſcendere deberet,
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quàm in aere aperto, quia nimirùm ab aeris cor
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pulentia aliquo pacto impeditur ipſius progreſ
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ſus (videmus enim in aere aperto fumum ampliari,
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diſſipari, ac diſpergi à prædicta aeris reſiſtentia,)
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que</
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in ſpatio illo vacuo, vel à quo aer deficit poſſit
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fumus naturali leuitate non impeditus liberiùs, & fa-</
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