Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
Cas.2. Dato umbilico S,deſcribenda ſit Trajectoria quæ rectas
duas
TR, tralicubi contingat. Ab umbilico in tangentes demitte
perpendicula
ST, St& produc ea­
32[Figure 32]
dem
ad V, v,ut ſint TV, tvæ­
quales
TS, tS.Biſeca Vvin O,
& erige perpendiculum infinitum
OH,rectamque VSinfinite pro­
ductam
ſeca in K& kita, ut ſit
VKad KS& Vkad kSut eſt
Trajectoriæ
deſcribendæ axis prin­
cipalis
ad umbilieorum diſtantiam.

Super
diametro Kkdeſcribatur
circulus
ſecans OHin H; & umbilicis S, H,axe principali ipſam
VHæquante, deſcribatur Trajectoria. Dico factum. Nam biſeca
Kkin X,& junge HX, HS, HV, Hv.Quoniam eſt VKad KS
ut
Vkad kS; & compofite ut VK+Vkad KS+kS; diviſimque

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