Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1Circulum ſemel deſcribere, deinde regulam interminatam CHita ap­
plicare ad punctum C,ut ejus pars FH,Circulo & rectæ FKinterje­
cta, æqualis ſit ejus parti CEinter punctum C& rectam AKſitæ.
LIBER
SECUNDUS.
DE MOTU
CORPORUM
Quæ de Hyperbolis dicta ſunt fa­
159[Figure 159]
cile applicantur ad Parabolas.
Nam
ſi XAGKParabolam deſignet quam
recta XVtangat in vertice X,ſintque
ordinatim applicatæ IA, VGut quæ­
libet abſciſſarum XI, XVdignitates
XIn, XVn;agantur XT, GT, AH,
quarum XTparallela ſit VG,& GT,
AHParabolam tangant in G& A:&
corpus de loco quovis A,ſecundum
rectam AHproductam, juſta cum
velocitate projectum, deſcribet hanc
Parabolam, ſi modo denſitas Medii,
in locis ſingulis G,ſit reciproce ut
tangens GT.Velocitas autem in Gea erit quacum Projectile per­
geret, in ſpatio non reſiſtente, in Parabola Conica verticem G,dia­
metrum VGdeorſum productam, & latus rectum (2GTq./nn-nXVG)
habente.
Et reſiſtentia in Gerit ad vim gravitatis ut GTad
(2nn-2n/n-2) VG.Unde ſi NAKlineam horizontalem deſignet, &
manente tum denſitate Medii in A,tum velocitate quacum corpus
projicitur, mutetur utcunque angulus NAH;manebunt longitu­
dines AH, AI, HX,& inde datur Parabolæ vertex X,& poſitio
rectæ XI,& ſumendo VGad IAut XVnad XIn,dantur om­
nia Parabolæ puncta G,per quæ Projectile tranſibit.

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