Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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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 elateria
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eius.</
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De vi per
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cap. 22.</
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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 elateria
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eius.</
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<
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">Poſtea ſubdit:
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Cylindrus aeris exterioris à quo (vt non
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nulli volunt) mercurij extantis ſegmentum ſuſtinetur, ne
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que plus, neque minus poteſt ſustinere, igitur ſi ferrum can
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dens admoueatur ſegmento vacuo fiſtulæ, nulla eſt ratio cur
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ſuperficies ſuprema mercurij ſubſidat. </
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<
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verò nix, vel trita glacies admoueatur, mercurius attolli
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tur.
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Sextum ar
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gumentum.</
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PROP. CVIII.
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Igneæ exhalationes corporeæ vehementisſima agitatione
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per ſe, cum variè impellendo, &
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torquẽdo
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particulas
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aeris in ſummitate fistulæ Torricellianæ reli
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ctas, facilè poſſunt ſubſidentem mercu
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rium æquilibratum deprimere.
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<
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">REſpondeo, quòd igneæ particulæ nedùm ſe ip
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ſas vehementèr agitant, commouentque, ſed
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præterea aereas quoque particulas in vitri ſummita
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te incluſas, vt dictum eſt, vehementiſſimè impellunt;
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porrò quia quodlibet corpus æquilibratum poteſt à
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quacumque exigua vi agitari, (vt demonſtrauimus
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in noſtro opere de vi percuſſionis) ſitque prædictus
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mercurius in fiſtula æquilibratus cum
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æquiponderã-te
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te</
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cylindro aereo externo, igitur neceſſariò ab inte
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ſtina illa agitatione ignearum, & aerearum particu
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larum ſuperficies mercurij percuſſa propelli poteſt,
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& ideò deprimi infra conſuetam eius altitudinem de
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bet, è contrà adhibita niue, vel trita glacie, ſpatium
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illud dum igne priuatur, & deficit quoque agitatio,
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& reuolutio nedum particularum ignis, ſed etiam̨ </
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