Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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ſus talis eſt, cùm primum cylindrus mercurij CB fer
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tur deorsùm transferendo eius centrum H in N, de
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nuò comparatur cum alio aquæ cylindro æquali ipſi
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FG è regione poſito, cuius centrum grauitatis erit
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punctum O, & tunc denuò creatur noua libra
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horizõ-talis
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talis</
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NO ſecta à rectis LP & MQ parallelis ENGO,
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in P & Q cuius centrum P, quia denuò partes aquæ
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collaterales ſupernæ & infernæ ſibi ipſis æquilibratæ
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non adiuuant, neque impediunt duo æqualia corpo
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ra mercuriale ex N, & aqueum ex O, quæ ad inuicem
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comparantur in eadem libra horizontali,
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cumq;
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hæc
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à parallelis lineis HN, MQ, & IO in eiſdem rationi
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bus diuidatur, perductum erit centrum grauitatis prę
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dictorum corporum ad punctum Q, vnde patet de
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ſcendiſſe per rectam lineam MQ perpendicularem ad
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horizontem, perdurabitque eius deſcenſus,
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quouſq;
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corpus mercuriale CB ad ſitum infimum fiſtulæ DE
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perducatur, quando nimirum eius grauitatis
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centrũ
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H præcisè infimum ſitum K fiſtulæ attinget. </
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Cap. 2. de
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momentis
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grauium in
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fluido inna
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tantium</
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Cap. 2. de
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momentis
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grauium in
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fluido inna
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tantium</
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<
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">Nec dicas fictionem eſſe quòd adſit libra horizon
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talis directa HI, quæ perpetuò renouetur, nam reue
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rà fulciuntur, ſuſtentanturque duo cylindri CB, & G
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F à plano aquæ ſubiectæ CF quod quidem, mobile eſt,
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cùm cedat deſcenſui mercurij CB & ſuperficies F
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eleuetur eodem tempore & pari velocitate circa eius
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punctum intermedium, igitur prædicta duo corpora
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BC, & GF dum ambo premunt libram fluidam ſub
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iectam ſuis ponderibus, & coguntur moueri ſimùl æ
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què velociter contrarijs lationibus neceſſariò libram </
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