Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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391 - 420
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238
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lineis:
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trãslato
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inſtrumento ad altitudinem pedum̨
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900. ſupra montis radicem, mercurij altitudo fuit ſo
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lummodò pollicum 25. in cacumine verò montis vbi
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altitudo ab eius radice erat pedum 3000. eleuatio
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mercurij fuit pollicum 24. lin. 2. conſtat ergo nedùm
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minui compreſſionem quando minuitur aeris altitu
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do, ſed etiam euincitur difformitas grauitatis ipſius
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aeris; conijcitur enim, quòd aer habeat conſiſtentiam
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veluti ſpongioſam
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ſitq;
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veluti lanæ cumulus, cuius
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partes ſuperiores dum comprimunt infimas, reddunt
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aeris regionem difformiter grauem pro varia earum̨
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compreſſione, & conſtipatione, & pro varia miſtu
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ra particularum aquæ, & terræ. </
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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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<
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">Idipſum poſtea obſeruauimus Florentiæ in altiſſi
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ma turri palatij, in qua aſcenſis ſolummodò cubitis
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50. ſupra infimam plateam, & palatij atrium depreſ
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ſus apparuit mercurius ſpatio vnius gradus, ſcilicèt
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decima parte vnius digiti, at poſtea perducto inſtru
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mento ad altitudinem 100.
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abbr
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cubitorũ
">cubitorum</
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depreſſio mer
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curij minor fuit altero gradu euidenti, & notabili
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defectu. </
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<
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id
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s.001230
">Idemque poſtea obſeruatum fuit in monti
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bus propè Florentiam, & ne ſuſpicio ſubiret aeris ſu
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premi frigiditatem depreſſiſſe mercurium in fiſtulą
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elegimus loca, & tempora commoda, ſcilicèt calefa
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cta à ſole in turris cacumine, & vmbroſa in eius ra
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dicibus, vt eorum temperies eadem eſſet, & hoc in
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dicabatur adhibitis perfectiſſimis termometris, quç
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oſtendebant aerem in ſummitate turris, aut eadem̨
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temperio, aut calidiori ſeruari quem in radice turris </
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