Gassendi, Pierre, De proportione qua gravia decidentia accelerantur, 1646

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1licam, neque tantum temporis, exſcendendo, quan­
tum aſcendendo conſumi; ac proinde lapidem illum
neque peruenturum ad mali carcheſium, neque reca­
ſurum in pedem eiuſdem: verùm iſta aut colliguntur
ex ijs, quæ ſunt dicta in Epiſtolis, aut in promptu
ſunt, facileque occurrunt.
Et de Definitione huc­
vſque.
De Poſtulato Galilei circa Motum ſuper æquè altis, non
æquè inclinatis planis.
XIII. Inſectaris ſecundo loco, tanquam aliam
erroris cauſſam, Quod Galileus ſibi dari, & gratis
concedi, inquis, poſtulat, Gradus velocitatis eiuſdem
mobilis ſuper diuerſas planorum inclinationes acquiſitos tunc
eſſe æqualeis, cùm eorumdem planorum eleuationes ponuntur
æquales; hoc eſt gradus velo­
13[Figure 13]
citatis ab eodem globo (exem­
pli gratia) per plana CA, &
CD deſcendente, in punctis
A, & D acquiſitos, eſſe inter ſe
æqualeis, quòd æqualem, vel potiùs eandem eleua­
tionem habeant, videlicet BC. Hoc enim poſtula­
tum, inquis, cùm neque ex terminis notum ſit, neque vlla
ſufficiente experientia confirmatum; imò cùm rationes etiam
non deſint, quibus oppoſitum probabilius reddatur (nempe
gradus velocitatis per longius planum acquiſitos gradibus
per breuius planum acquiſitis eſſe minores) id à Galileo non
peti, ſed debuerat demonſtrari cùm præſertim maxima pars
ſubſequentium theorematum hoc vnico postulato nitantur.
Quid enim certi ex incertis concludi poteſt. aut ex principie,

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