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

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1ratur ſemper æqualibus temporibus. Senſus eſt, cùm
ſpatium GH, quod ſuppoſui à naui peruadi momen­
tis decem, poſſit fieri contractius, ita vt iiſdem decem
momentis, ſeu æquali tempore non percurratur, niſi
ſpatium Si, vel V g, vel Y e vel a c:ſicque lineæ parabo
licæ ex S, in B, ad vſque ; vel ex V, in B, ad vſque g, & c.
fiant ſemper contractiores, quàm ſit GBH: Et cùm
è contra idem ſpatium poſſit ſieri amplius; ita vt iiſdem
decem momentis, ſeu æquali tempore percurratur ſpa­
tium duplò, triplò, quadruplò, & quantumcúmque vo­
les, pro nauis celeritate, expanſius; ſicque lineæ parabo­
licæ fiant ſemper, ſemperque apertiores, quàm ſit ea­
dem parabolica GBH: Nihilominùs neque lapidem
per contractiores motum, peruaſurum illas tempore
breuiore; neque motum per appertiores, peruaſurum
ipſas tempore longiore, quàm ſit tempus, quo per­
uadit memoratam GBH. Quippe, ſeu nauis celeriter,
ſeu tardè moueatur, tantundem ſemper temporis in­
ſumit lapis, vt ex pede mali A, perueniat ad verticem
B; & rursùs tantundem, vt ex vertice B, perueniat ad
pedem A.
Quare & cùm intereà deſcribantur per aërem
lineæ parabolicæ inæquales, neceſſe eſt ſemper deſcri­
bant æqualibus temporibus: omnibus putà exæqua­
tis vni, eidemque tempori, quod inſumitur ex A in
B, & ex B in A, communi menſura.
Elicio vndecimò, Si lapis dimittatur ex B, & loco
deſcenſus per lineam ſemiparabolicam BH, deſcribat
etiam quantùm voles vel contractiorem, vel apertio­
rem: peruaſurum tamen omneis eiuſcemodi ſemipara­
bolicas lineas æqualibus temporibus: Quippe ea om-

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