Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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1naui promota totidem momentis malus fuerit ſuc­
ceſſiuè cd, ef, gh, 1K, Hl; lapis ſit etiam futurus
ſucceſſiuè in N, O, P, Q, ac tandem in H.
VII. Iam elicio primò, lineam, quam motu ſuo
deſcribit lapis, apparere quidem iis, qui in naui ſunt,
eſſe rectam, perpendicularemque, hoc eſt directam
ſecundum longitudinem, erectionemque mali GR,
vel ST, vel VX, &c.
cùm nempe ab eo lapis non diſ­
cedat: ſed eſſe tamen reipſâ curuam, parabolicamve,
& qualis planè deſcriberetur, ſi quieſcente naui, &
malo exſiſtente AB lapis proijceretur obliquè ex G,
verſus B, decideretque in H.
Nec te moretur, quòd
linea curua GB ſit longior, quàm linea recta GR, ac
major proinde virtus requiratur ad proijciendum ex
G in B, quàm ex G in R, vel, quod eſt idem, ex A in
B.
Nam licet naui quieſcente pro; ector majorem ap­
plicet virtutem, vt ex G proiiciat in B, quàm vt ex A
proiiciat in idem B; non requiritur tamen, vt naui mo­
ta, maiorem ex ſe applicet, ad ita proiiciendum, vt
lapis ex G perueniat ad locum B, quàm requiratur vt
ex G lapis perueniat ad R (quò verſus proiectio fit)
vel ex A ad ipſum B: quoniam quod de eſt applicitæ à
proiectore virtuti propriæ, vt lapis ex G perueniat ad
B, id ſuppletur vi tranſlatitia adiecta à naui: adeò vt,
cùm lapidis motus ſit compoſitus ex motu ſursùm, &
motu prorsùm, ſeu ex perpendiculari, & horizontali;
ipſa quoque vis proiectionis ita ſit compoſita ex vi
proijcientis propria, & ex vi impreſſa à naui, vt quic­
quid eſt motus ſursùm à priore ſit, quicquid motus
prorsùm à poſteriore; ſicque vis adiecta à naui, dum

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