Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1datur latus rectum Parabolæ, ut
notum eſt.
Et ſumendo 2DP
ad latus illud rectum, ut eſt vis
gravitatis ad vim reſiſtentiæ,
datur DP.Dein ſecando DC
in A,ut ſit CPXACad
DPXDAin eadem illa rati­
one gravitatis ad reſiſtentiam,
dabitur punctum A.Et inde
datur Curva DraF.
DE MOTU
CORPORUM
Corol.5. Et contra, ſi datur
147[Figure 147]
Curva DraF,dabitur & ve­
locitas corporis & reſiſtentia
Medii in locis ſingulis r.Nam
ex data ratione CPXACad
DPXDA,datur tum reſiſten­
tia Medii ſub initio motus, tum
latus rectum Parabolæ: & inde
datur etiam velocitas ſub initio
motus.
Deinde ex longitudine
tangentis rL,datur & huic
proportionalis velocitas, & ve­
locitati proportionalis reſiſten­
tia in loco quovis r.
Corol.6. Cum autem longitu­
do 2DPſit ad latus rectum
Parabolæ ut gravitas ad reſiſtentiam in D; & ex aucta velocitate
augeatur reſiſtentia in eadem ratione, at latus rectum Parabolæ au­
geatur in ratione illa duplicata: patet longitudinem 2DPaugeri
in ratione illa ſimplici, adeoque velocitati ſemper proportionalem
eſſe, neque ex angulo CDPmutato augeri vel minui, niſi mu­
tetur quoque velocitas.
Corol.7. Unde liquet methodus determinandi Curvam DraF
ex Phænomenis quamproxime, & inde colligendi reſiſtentiam &
velocitatem quacum corpus projicitur.
Projiciantur corpora duo
ſimilia & æqualia eadem cum velocitate, de loco D,ſecundum
angulos diverſos GDP, cDp(minuſcularum literarum locis ſub­
intellectis) & cognoſcantur loca F, f,abi incidunt in horizontale
planum DC.Tum, aſſumpta quacunque longitudine pro DP
vel Dp,fingatur quod reſiſtentia in Dſit ad gravitatem in ra-

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