Borelli, Giovanni Alfonso
,
De motionibus naturalibus a gravitate pendentibus
,
1670
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eſt cylindri IG, intelligatur aqua primò eleuari iņ
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ſitu T & deprimi in dextro canali in G, & hinc eleua
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ta aqua ad I deſcendat à T ad X coniungantur quę
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duæ rectæ lineæ AG, & BH ſe ſecantes in M, eritque
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punctum Min horizontali EL conſtitutum, propterea
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quod duo cylindri aquæ AB, & HG æquales ſunt in
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ter ſe, cum ſemiſſes ſint cylindrorum æqualium TX &
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IG, ergo altitudo AB ad HG eſt vt eiuſdem cylindri
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baſis H ad baſim A: eadem ratione AE ad LG erit vt
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baſis H ad
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basĩ
">basim</
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A quare altitudo AE ad LG erit vt AB
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ad HG,
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sũq;
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duæ rectæ lineæ AE & GL
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perpẽdicula
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res ad
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horizontalẽ
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FG, vel EL, & ideò inter ſe paral
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lelæ, ergo ob ſimilitudinem triangulorum vt AM ad
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MG ita erit BM ad MH, nec non EM ad ML, & ideo
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rectæ AG, BH, & EL ſe mutuo ſecabunt in eodem̨
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puncto M. poſtea vt moles aquæ XBF vnà cum GHI
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ad molem aquæ IHG ita fiat diſtantia HB ad BQ, &
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diuidendo, vt moles aquæ XBF ad GHI ita erit di
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ſtantia HQ ad QB, ideoque ex elementis mechanicis
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punctum Q erit centrum grauitatis aquæ XBF vnà
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cum GHI. quando verò aqua erat in ſummitate T &
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canalis GLV omninò exhauſtus erat, tunc quidem̨
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centrum grauitatis totius aquæ TAF perſiſtens iņ
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puncto A medio eiuſdem canalis perindè operare
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tur ac ſi ſuſpenſus fuiſſet cylindrus èx puncto A: de
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preſſa poſtmodum aqua vſque ad Y & eleuata vſque
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ad L in oppoſito canali, denuo centrum grauitatis re
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pertum prædictæ aquæ exiſtet in puncto R & tandem
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depreſſa aqua vſque ad A in primo caſu & vſque ad </
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