Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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datat, & incrementa velocitatis eius tandem ad æqua­
bilitatem reduci debent.
Cap. 11. gra­
uia in fluido
velocitati­
bus inæqua­
libus ferri
debere.
SIt vas NX omninò vacuum, & NZ ſit repletum a­
liquo fluido aereo v.g. & intelligantur particu­
læ temporis inter ſe æquales AB, BD, DG, GK, KN,
& in primo tempore AB graue deſcendens in vacuo
acquirat gradum impetus BC, in ſequenti verò tem­
pore BD præter gradum DE æqualem BC, quem iņ
priori tempore acquiſierat, & in eo conſeruatur, ac­
quiret quoque nouum gradum̨
178[Figure 178]
impetus EF æqualem priori BC,
pariterque in tertio temporę
prioribus æquali DG, præter im­
petum GH ab eo acquiſitum iņ
tempore pręcedenti AD, acqui­
rit nouum gradum impetus HI
æqualem prioribus EF, vel BC,
tandem in tempore GK præter
gradum KL, quem prius acquiſierat, denuò ei ſuper­
additur nouus gradus impetus LM æqualis priori
BC; & hoc procùl dubio contingit ablatis omnibus
impedimentis in vaſe NX: at ſi motus ſolidi ſup­
ponatur in medio fluido NZ fieri, ibi duplici nomi­
ne gradus velocitatum acquirendi debilitari debent,
primò propter percuſſionem, quam mobile corpori
fluido inferre debet, ſecundò propter reſiſtentiam̨
machinularum, ſeu glutinis eiuſdem fluidi; neceſsè
ergo eſt, vt quilibet horum graduum impetus vtpo­
tè BC non perpetuò conſeruetur integer, & illibatus,

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